Autoimmune Skin Diseases Practice Questions

Q: Heliotrope rash is seen in which condition?

Dermatomyositis. **Explanation:** **Dermatomyositis** is an idiopathic inflammatory myopathy characterized by symmetrical proximal muscle weakness and distinctive cutaneous findings. The **Heliotrope rash** is considered a pathognomonic sign of this condition. It presents as a violaceous (reddish-purple) eruption on the upper eyelids, often accompanied by periorbital edema. The name is derived from the *Heliotropium* flower, which shares this characteristic purple hue. **Analysis of Options:** * **Dermatomyositis (Correct):** It is the only condition among the choices that features both the Heliotrope rash and Gottron’s papules (violaceous papules over bony prominences like MCP/PIP joints). * **Polymyositis:** While it shares the same proximal muscle weakness as dermatomyositis, it is strictly a muscle disease and **lacks** the characteristic cutaneous manifestations (no rash). * **Inclusion Body Myositis:** This typically affects older individuals and involves distal muscles (like finger flexors) asymmetrically. It does not present with a Heliotrope rash. * **Dermatitis Herpetiformis:** This is an intensely pruritic, blistering skin disease associated with Celiac disease. It presents with grouped vesicles on the elbows, knees, and buttocks, not a facial violaceous rash. **High-Yield Clinical Pearls for NEET-PG:** * **Gottron’s Papules:** The most specific sign of Dermatomyositis. * **Shawl Sign/V-Sign:** Erythema over the upper back/shoulders and anterior chest. * **Holster Sign:** Erythema on the lateral thighs. * **Mechanic’s Hands:** Hyperkeratosis and fissuring of the palms and lateral fingers (associated with Anti-Jo-1 antibodies). * **Malignancy:** Dermatomyositis in adults is frequently associated with internal malignancies (paraneoplastic syndrome), necessitating age-appropriate cancer screening.

Q: Salt and pepper skin is a characteristic finding in which of the following conditions?

Scleroderma. **Explanation:** **Scleroderma (Systemic Sclerosis)** is the correct answer. The "Salt and Pepper" appearance is a classic clinical sign of cutaneous sclerosis, particularly in the systemic form. It refers to **vitiligo-like hypopigmentation** with **perifollicular sparing** (retained pigmentation around the hair follicles). * **Pathophysiology:** In Scleroderma, there is a loss of pigment in the inter-follicular epidermis. However, the melanocytes located in the hair follicles are preserved and migrate to the surface, creating dark spots against a pale, leukodermic background. This is often one of the earliest signs of the disease and is most commonly seen on the upper trunk, neck, and forehead. **Analysis of Incorrect Options:** * **Dermatomyositis:** Characterized by the **Heliotrope rash** (periorbital violaceous edema) and **Gottron’s papules** (over bony prominences). It does not typically present with salt and pepper pigmentation. * **Systemic Lupus Erythematosus (SLE):** Classic findings include the **Malar (butterfly) rash** and photosensitivity. While SLE can cause post-inflammatory pigmentary changes, the specific perifollicular sparing of "salt and pepper" skin is not a feature. * **Syphilis:** Secondary syphilis presents with a generalized maculopapular rash involving the palms and soles. It may cause "moth-eaten" alopecia, but not this specific pattern of leukoderma. **High-Yield Clinical Pearls for NEET-PG:** * **Scleroderma Triad:** Vascular injury (Raynaud's), Autoimmunity (Anti-Scl70/Anti-centromere), and Fibrosis. * **Other Skin Signs:** Microstomia (small mouth), Beaked nose (Bird-like facies), and Sclerodactyly. * **Salt and Pepper Skin** is also a term used in pathology to describe the **chromatin pattern** of Neuroendocrine tumors (e.g., Carcinoid, Small cell carcinoma), but in Dermatology, it specifically refers to Scleroderma.

Q: A 60-year-old female presents with tense bullae on her lower extremities and subepidermal bullous lesions on microscopy. What is the most likely diagnosis?

Bullous pemphigoid. **Explanation:** The clinical presentation of **tense bullae** in an elderly patient, combined with **subepidermal** cleavage on microscopy, is the classic hallmark of **Bullous Pemphigoid (BP)**. **1. Why Bullous Pemphigoid is correct:** BP is an autoimmune blistering disease caused by IgG autoantibodies against **BP180 (Type XVII collagen)** and **BP230** in the hemidesmosomes. Because the split occurs at the dermo-epidermal junction (below the epidermis), the roof of the blister is thick, resulting in "tense" bullae that do not rupture easily. It typically affects the elderly and involves the limbs and trunk. **2. Why other options are incorrect:** * **Pemphigus Vulgaris:** Characterized by **flaccid** bullae (due to intraepidermal split/acantholysis) and a positive Nikolsky sign. It involves the oral mucosa early and shows "row of tombstones" on histology. * **Erythema Multiforme:** Presents with characteristic **target (iris) lesions**. While it can blister, the clinical morphology and demographic differ from the classic presentation of BP. * **Dermatitis Herpetiformis:** Presents as intensely pruritic, grouped vesicles (herpetiform) on extensor surfaces, associated with Celiac disease. Histology shows **neutrophilic microabscesses** at dermal papillary tips. **High-Yield Clinical Pearls for NEET-PG:** * **Direct Immunofluorescence (DIF):** Shows **linear** IgG and C3 deposits along the basement membrane zone (BMZ). * **Salt-split skin study:** Fluorescence is seen on the **roof** (epidermal side) of the split. * **Nikolsky Sign:** Negative in BP (Positive in Pemphigus). * **Treatment:** Potent topical corticosteroids (e.g., Clobetasol) or systemic steroids.

Q: Which of the following is not seen in Dermatomyositis?

Salmon Rash. **Explanation:** The correct answer is **D. Salmon Rash**. This rash is a characteristic feature of **Systemic Onset Juvenile Idiopathic Arthritis (Still’s Disease)**, not Dermatomyositis. It is typically an evanescent (transient), non-pruritic, salmon-pink maculopapular eruption that coincides with fever spikes. **Why the other options are seen in Dermatomyositis:** * **Gottron’s Papules (Option A):** These are considered **pathognomonic** for Dermatomyositis. They are violaceous, flat-topped papules found over the dorsal aspects of the interphalangeal and metacarpophalangeal joints. * **Heliotrope Rash (Option B):** A classic sign consisting of a violaceous (lilac) eruption on the upper eyelids, often associated with periorbital edema. * **Mechanic’s Hands (Option C):** Characterized by hyperkeratosis, scaling, and fissuring on the palmar and lateral aspects of the fingers. While seen in Dermatomyositis, it is strongly associated with **Anti-synthetase syndrome** (Anti-Jo-1 antibodies). **High-Yield Clinical Pearls for NEET-PG:** * **Shawl Sign:** Erythema over the upper back and shoulders. * **V-Sign:** Erythema over the anterior neck and upper chest. * **Holster Sign:** Poikiloderma on the lateral aspects of the thighs. * **Malignancy:** Dermatomyositis in adults is frequently a **paraneoplastic syndrome** (most commonly associated with ovarian, lung, and gastric cancers). * **Antibodies:** **Anti-Mi-2** is highly specific for Dermatomyositis; **Anti-Jo-1** is linked to interstitial lung disease (ILD).

Q: A person presents with hemorrhagic fluid in tense blisters at the dermoepidermal junction. What is the most probable diagnosis?

Pemphigoid. ### Explanation **Correct Option: A. Pemphigoid (Bullous Pemphigoid)** The diagnosis is **Bullous Pemphigoid (BP)** based on two pathognomonic clinical and histological features mentioned in the question: 1. **Tense Blisters:** In BP, the split occurs at the **dermoepidermal junction (subepidermal)**. Because the entire thickness of the epidermis forms the roof of the blister, it is structurally strong and "tense," unlike the flaccid blisters seen in intraepidermal diseases. 2. **Hemorrhagic Fluid:** Subepidermal blisters often involve damage to the papillary dermal vessels, leading to the presence of blood (hemorrhagic fluid) within the bullae. **Why the other options are incorrect:** * **B, C, and D (Pemphigus Group):** All forms of Pemphigus (Vulgaris, Vegetans, and Drug-induced) are **intraepidermal** blistering diseases caused by acantholysis (loss of keratinocyte adhesion). Because the roof of these blisters is very thin (only a portion of the epidermis), they are characteristically **flaccid**, rupture easily, and are rarely hemorrhagic. --- ### NEET-PG High-Yield Pearls * **Target Antigen:** In Bullous Pemphigoid, antibodies (IgG) are directed against **BP180 (BPAG2)** and **BP230 (BPAG1)** in the hemidesmosomes. * **Direct Immunofluorescence (DIF):** Shows **linear** deposition of IgG and C3 along the basement membrane zone (BMZ). * **Nikolsky Sign:** Characteristically **negative** in Pemphigoid (positive in Pemphigus). * **Clinical Clue:** BP often starts with a non-specific "urticarial" or itchy prodromal phase, especially in elderly patients. * **Histology:** Look for a **subepidermal cleft** with an inflammatory infiltrate rich in **eosinophils**.

Q: Which of the following disorders is associated with acantholysis?

Pemphigus vulgaris. **Explanation:** **Acantholysis** is the loss of intercellular connections (desmosomes) between keratinocytes, leading to the formation of intraepidermal blisters. **1. Why Pemphigus Vulgaris is Correct:** Pemphigus vulgaris is the classic example of an **intraepidermal** autoimmune blistering disease. It is caused by IgG antibodies against **Desmoglein 3** (and sometimes Desmoglein 1). The destruction of these desmosomal proteins leads to acantholysis, resulting in "tombstoning" of the basal layer and the formation of flaccid bullae. **2. Why Other Options are Incorrect:** * **Pemphigoid (Bullous Pemphigoid):** This is a **subepidermal** blistering disease. The pathology involves antibodies against BP180/BP230 in the hemidesmosomes. There is no loss of keratinocyte-to-keratinocyte adhesion (no acantholysis). * **Erythema Multiforme:** This is a hypersensitivity reaction characterized by keratinocyte necrosis and subepidermal separation, typically triggered by HSV or drugs. It does not involve primary acantholysis. * **Dermatitis Herpetiformis:** This is an IgA-mediated disease associated with Celiac disease. It is characterized by **subepidermal** blisters and neutrophilic microabscesses at the dermal papillary tips. **Clinical Pearls for NEET-PG:** * **Nikolsky Sign:** Positive in Pemphigus (due to acantholysis) but negative in Bullous Pemphigoid. * **Tzanck Smear:** Shows "Acantholytic cells" (Tzanck cells)—large, round keratinocytes with hyperchromatic nuclei—in Pemphigus. * **Immunofluorescence:** Pemphigus shows a **"fishnet" or "reticular"** pattern of IgG, while Bullous Pemphigoid shows a **linear** pattern at the dermo-epidermal junction. * **Other Acantholytic Disorders:** Hailey-Hailey disease (familial benign pemphigus) and Darier disease.

Q: Which of the following drugs is used in generalized lichen planus?

Both Dapsone and Systemic steroids. **Explanation:** Lichen Planus (LP) is a chronic inflammatory, T-cell mediated autoimmune condition characterized by the "6 Ps": Planar, Purple, Polygonal, Pruritic, Papules, and Plaques. While localized LP is typically managed with topical corticosteroids, **generalized or eruptive lichen planus** requires systemic intervention to control the widespread inflammation and prevent post-inflammatory hyperpigmentation. * **Systemic Steroids (Option A):** These are the first-line systemic treatment for generalized LP. They work by rapidly suppressing the T-cell mediated immune response, reducing itching, and halting the progression of new lesions. * **Dapsone (Option B):** This is a recognized second-line or adjunctive treatment. It possesses anti-inflammatory and immunomodulatory properties that are particularly effective in treating the bullous variant of LP and generalized cases that are resistant to or require a steroid-sparing agent. Since both drugs are established systemic therapies for extensive disease, **Option C** is the most accurate choice. **Why other options are incorrect:** * **Methotrexate (Option D):** While sometimes used in recalcitrant or erosive mucosal LP, it is not considered a standard first-line systemic therapy for generalized cutaneous LP compared to steroids and Dapsone. **High-Yield Clinical Pearls for NEET-PG:** * **Wickham Striae:** Fine white reticular scales on the surface of papules (due to hypergranulosis). * **Histopathology:** Characterized by "saw-tooth" rete ridges, Civatte bodies (apoptotic keratinocytes), and a band-like lymphocytic infiltrate at the dermo-epidermal junction. * **Koebner Phenomenon:** Development of lesions along the line of trauma (also seen in Psoriasis and Vitiligo). * **Associations:** Strongly associated with **Hepatitis C virus** infection.

Q: A 45-year-old female presented with recurrent oral erosions followed by multiple flaccid bullae on the trunk and extremities. A Tzanck smear showed acantholytic cells, and direct immunofluorescence demonstrated intercellular IgG deposits in the epidermis. What is the most probable diagnosis?

Pemphigus vulgaris. **Explanation:** The clinical presentation and diagnostic findings are classic for **Pemphigus Vulgaris (PV)**. 1. **Why Pemphigus Vulgaris is correct:** PV is an autoimmune blistering disease caused by IgG antibodies against **Desmoglein 3** (and sometimes Desmoglein 1). * **Clinical:** It typically begins with **recurrent oral erosions** (mucosa first) followed by **flaccid bullae** on the skin that rupture easily (positive Nikolsky sign). * **Cytology:** A Tzanck smear reveals **acantholytic cells** (Tzanck cells)—keratinocytes that have lost their intercellular connections. * **Immunofluorescence (DIF):** Shows a characteristic **"fishnet" or "chicken-wire" pattern** due to intercellular IgG and C3 deposits throughout the epidermis. 2. **Why other options are incorrect:** * **Bullous Pemphigoid:** Presents with **tense bullae** in older patients. DIF shows **linear** IgG/C3 deposits along the basement membrane zone (subepidermal), not intercellular. * **Stevens-Johnson Syndrome:** An acute hypersensitivity reaction characterized by targetoid lesions and extensive epidermal necrolysis. It is not an acantholytic process and would not show the fishnet DIF pattern. * **Herpes Simplex 1:** While it shows acantholytic cells on Tzanck smear, it also features **multinucleated giant cells** and viral inclusions. It presents as grouped vesicles on an erythematous base, not generalized flaccid bullae. **High-Yield Pearls for NEET-PG:** * **Nikolsky Sign & Bulla Spread Sign (Asboe-Hansen):** Both are **positive** in Pemphigus Vulgaris but negative in Bullous Pemphigoid. * **Row of Tombstones:** Histopathology shows suprabasal clefting with a single layer of basal cells remaining attached to the basement membrane. * **Antigen:** Desmoglein 3 (Mucosal-dominant); Desmoglein 1 + 3 (Mucocutaneous).

Q: A patient presents with bullous lesions on the face, axilla, and chest, which initially appeared in the mouth. The lesions are described as round and oval with serous fluid and appear 'flabby.' Lateral spread of fluid is observed upon applying pressure. Given a clinical diagnosis of pemphigus vulgaris (PV), what is the typical age of onset for this condition?

40-60 years of age. ### Explanation **1. Why Option D is Correct:** Pemphigus Vulgaris (PV) is an autoimmune blistering disease characterized by the production of IgG antibodies against **Desmoglein 3** (and sometimes Desmoglein 1). These antibodies cause acantholysis (loss of cell-to-cell adhesion). Epidemiologically, PV typically manifests in middle-aged adults, with the peak incidence occurring between the **4th and 6th decades of life (40–60 years)**. It shows no significant gender predilection. **2. Why Other Options are Incorrect:** * **Options A & B (<20 years):** While "Pemphigus Juvenilis" exists, it is extremely rare. Bullous diseases in children are more likely to be Linear IgA Bullous Dermatosis or Bullous Impetigo. * **Option C (20–40 years):** While cases can occur in this range, it is less common than the 40–60 age bracket. Conditions like Dermatitis Herpetiformis often present in this younger adult demographic. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Initial Site:** Oral mucosa is the first site of involvement in 50–70% of cases ("First to come, last to go"). * **The Blister:** Because the split is intraepidermal (suprabasal), the bullae are **flaccid/flabby** and rupture easily, leaving painful erosions. * **Nikolsky Sign:** Positive (perilesional skin shears off with lateral pressure). * **Asboe-Hansen Sign (Indirect Nikolsky/Bulla Spread Sign):** Positive (lateral extension of the blister when pressure is applied to the roof). * **Tzanck Smear:** Shows **Acantholytic cells (Tzanck cells)**—large, round keratinocytes with hyperchromatic nuclei and a peripheral halo of cytoplasm (condensed at the rim). * **Immunofluorescence (DIF):** Shows a characteristic **"Fish-net" or "Lace-like"** pattern of IgG and C3 deposits in the intercellular spaces.

Question 1

Heliotrope rash is seen in which condition?

Accepted Answer

Dermatomyositis

Answer

Dermatitis herpetiformis

Answer

Polymyositis

Answer

Inclusion body myositis

Question 2

Salt and pepper skin is a characteristic finding in which of the following conditions?

Accepted Answer

Scleroderma

Answer

Dermatomyositis

Answer

Systemic Lupus Erythematosus (SLE)

Answer

Syphilis

Question 3

A 60-year-old female presents with tense bullae on her lower extremities and subepidermal bullous lesions on microscopy. What is the most likely diagnosis?

Accepted Answer

Bullous pemphigoid

Answer

Pemphigus vulgaris

Answer

Erythema multiforme

Answer

Dermatitis herpetiformis

Question 4

Which of the following is not seen in Dermatomyositis?

Accepted Answer

Salmon Rash

Answer

Gottron's papules

Answer

Heliotrope rash

Answer

Mechanic's hands

Question 5

A person presents with hemorrhagic fluid in tense blisters at the dermoepidermal junction. What is the most probable diagnosis?

Accepted Answer

Pemphigoid

Answer

Pemphigus vulgaris

Answer

Pemphigus vegetans

Answer

Drug-induced pemphigus

Question 6

What is the topical treatment for Lichen planus?

Accepted Answer

Systemic steroids

Answer

Topical Salicylic acid

Answer

UV ray

Answer

Erythromycin

Question 7

Which of the following disorders is associated with acantholysis?

Accepted Answer

Pemphigus vulgaris

Answer

Pemphigoid

Answer

Erythema multiforme

Answer

Dermatitis herpetiformis

Question 8

Which of the following drugs is used in generalized lichen planus?

Accepted Answer

Both Dapsone and Systemic steroids

Answer

Systemic steroids

Answer

Dapsone

Answer

Methotrexate

Question 9

A 45-year-old female presented with recurrent oral erosions followed by multiple flaccid bullae on the trunk and extremities. A Tzanck smear showed acantholytic cells, and direct immunofluorescence demonstrated intercellular IgG deposits in the epidermis. What is the most probable diagnosis?

Accepted Answer

Pemphigus vulgaris

Answer

Bullous Pemphigoid

Answer

Stevens-Johnson syndrome

Answer

Herpes simplex 1 infection

Question 10

A patient presents with bullous lesions on the face, axilla, and chest, which initially appeared in the mouth. The lesions are described as round and oval with serous fluid and appear 'flabby.' Lateral spread of fluid is observed upon applying pressure. Given a clinical diagnosis of pemphigus vulgaris (PV), what is the typical age of onset for this condition?

Accepted Answer

40-60 years of age

Answer

Under 10 years of age

Answer

10-20 years of age

Answer

20-40 years of age

Autoimmune Skin Diseases — MCQs

Autoimmune Skin Diseases — MCQs

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