Acne and Related Disorders Practice Questions

Q: Adapalene is used in treatment of:

Acne vulgaris. **Acne vulgaris** - **Adapalene** is a **topical retinoid** primarily used for the treatment of **acne vulgaris**. - It works by modulating **cell differentiation**, **keratinization**, and **inflammatory processes** in the skin, which helps prevent the formation of **comedones**. *Atopic dermatitis* - Treatment for **atopic dermatitis** typically involves **topical corticosteroids**, **calcineurin inhibitors**, and **emollients** to reduce inflammation and itching. - **Adapalene** is not a primary treatment for atopic dermatitis and may even cause skin irritation in patients with compromised skin barriers. *Psoriasis* - **Psoriasis** treatment often includes **topical corticosteroids**, **vitamin D analogs** (e.g., calcipotriene), and sometimes **systemic therapies** or **biologics**. - While other retinoids (e.g., **tazarotene**) can be used for psoriasis, adapalene is not a first-line treatment for this condition. *All of the options* - This option is incorrect because adapalene is specifically indicated for **acne vulgaris** and is not a primary or recommended treatment for **atopic dermatitis** or **psoriasis**. - The distinct mechanisms and conditions for which these skin diseases are treated make it unlikely for one drug to be indicated for all three.

Q: Which is the most commonly prescribed first-line oral antibiotic for moderate to severe acne vulgaris?

Minocycline. ***Minocycline*** - **Minocycline** is a **tetracycline derivative** and is frequently used as a first-line oral antibiotic for moderate to severe acne due to its **lipophilicity** and good tissue penetration. - It exhibits **anti-inflammatory** properties in addition to its direct antibacterial effects against *Cutibacterium acnes* (formerly *Propionibacterium acnes*). *Co-triamoxazole* - **Co-triamoxazole** (trimethoprim/sulfamethoxazole) is an antibiotic combination generally reserved for acne that has been unresponsive to other treatments due to concerns about **adverse effects** and development of resistance. - It is not typically considered a **first-line agent** for acne vulgaris due to its broader spectrum of activity and potential for significant side effects like **Stevens-Johnson syndrome**. *Penicillin* - **Penicillin** is effective against many bacterial infections, but it has **limited efficacy** against *Cutibacterium acnes*, the primary bacterium implicated in acne vulgaris. - It is not routinely used for the treatment of **acne vulgaris** due to its poor targeting of the causative organisms and the availability of more effective antibiotics. *Tetracycline* - While **tetracycline** is an older antibiotic that was widely used for acne, its efficacy is often less than newer tetracycline derivatives like minocycline and doxycycline. - It requires **dosing precautions** such as taking it on an empty stomach and avoiding dairy, which can affect patient adherence compared to newer options.

Q: A girl about to marry has comedonal acne. Drug to treat such a case is:

Retinoids. ***Retinoids*** - **Topical retinoids** (e.g., tretinoin, adapalene) are the gold standard for comedonal acne as they normalize **follicular keratinization** and prevent microcomedone formation. - Being **Category C in pregnancy**, topical retinoids require **contraception counseling** for women of childbearing age but are still first-line treatment with proper precautions. *Benzoyl peroxide* - **Benzoyl peroxide** has mild comedolytic properties but is primarily effective for **inflammatory acne** due to its antimicrobial action against *Cutibacterium acnes*. - Less effective than retinoids for purely **comedonal acne** as it doesn't address the core pathology of abnormal keratinization. *Estrogen* - **Hormonal therapy** with estrogen-containing contraceptives reduces sebum production by suppressing androgens but takes **3-6 months** to show effects. - More suitable for **hormonal acne** with inflammatory lesions rather than purely comedonal acne, and not first-line for this presentation. *Topical antibiotic* - **Topical antibiotics** (clindamycin, erythromycin) target bacterial overgrowth and inflammation but have limited efficacy in **non-inflammatory comedonal acne**. - Risk of **bacterial resistance** when used alone, and they don't address the underlying hyperkeratinization that causes comedone formation.

Q: Rhinophyma is a condition characterised by which of the following?

Hyperplasia of sebaceous glands. ***Hyperplasia of sebaceous glands*** - **Rhinophyma** is a severe form of rosacea primarily affecting the nose, characterized by **marked sebaceous gland hyperplasia** and connective tissue overgrowth. - This leads to the classic appearance of a large, red, bulbous nose with thickened skin and prominent pores. *Perioral dermatitis* - This condition presents as small, red papules and pustules around the mouth, not typically involving the nose in a generalized, hypertrophic manner. - It is often associated with topical corticosteroid use or irritants, which is distinct from the pathophysiology of rhinophyma. *Sweat gland hypertrophy* - While skin conditions can involve various glands, rhinophyma specifically affects **sebaceous glands**, not sweat glands (eccrine or apocrine). - Sweat gland hypertrophy is not a characteristic feature of rhinophyma and would not result in the distinct nasal enlargement seen. *Butterfly rash on the nose* - A **butterfly rash** (malar rash) is typically associated with conditions like **Systemic Lupus Erythematosus (SLE)**, affecting the cheeks and bridge of the nose symmetrically. - This rash is generally flat or slightly raised and erythematous, not characterized by the nodular hyperplasia and tissue thickening seen in rhinophyma.

Q: Which of the following are treatment options for acne vulgaris?

All of the options. ***All of the options*** - All listed options (Isotretinoin, Topical erythromycin, and Oral Minocycline) are well-established and commonly used **treatment options for acne vulgaris**, depending on the severity and type of acne. - The choice of treatment often follows a stepped approach, starting with topical agents for mild to moderate acne and progressing to oral medications like antibiotics or isotretinoin for more severe or resistant cases. *Isotretinoin* - **Isotretinoin** is a powerful oral retinoid primarily used for **severe, recalcitrant nodular acne** that has not responded to other treatments. - It works by reducing sebum production, follicular hyperkeratinization, inflammation, and the growth of *P. acnes*. *Topical erythromycin* - **Topical erythromycin** is an **antibiotic** used to treat mild to moderate inflammatory acne by reducing the growth of *Cutibacterium acnes* (formerly *Propionibacterium acnes*) and decreasing inflammation. - It is often combined with other topical agents like benzoyl peroxide to minimize the development of **antibiotic resistance**. *Oral Minocycline* - **Oral minocycline** is a **tetracycline antibiotic** used for moderate to severe inflammatory acne. - It reduces bacterial populations on the skin and exhibits **anti-inflammatory properties**, making it effective for widespread or deeper lesions.

Q: Acid that is decreased in acne comedones is?

Linoleic acid. ***Linoleic acid*** - A decrease in **linoleic acid** (an essential fatty acid) within the sebum leads to increased **comedone formation** in acne. - Reduced linoleic acid alters the **sebum composition**, making it more pro-inflammatory and less fluid, which contributes to follicular plugging. *Palmitic acid* - **Palmitic acid** is a common **saturated fatty acid** found in sebum, and its levels are generally not decreased in acne comedones; rather, the *ratio* of fatty acids is altered. - It is a major component of **triglycerides** and is often found in *higher proportions* relative to essential fatty acids in acne-prone skin. *Acetic acid* - **Acetic acid** is a **short-chain fatty acid** and is not a primary component of human sebum in significant quantities, nor is its decrease implicated in acne pathogenesis. - It is more commonly associated with microbial metabolism or certain skin infections rather than sebaceous gland dysfunction in acne. *Linolenic acid* - **Linolenic acid** (alpha-linolenic acid) is another **essential fatty acid**, but it is **linoleic acid** (omega-6) that is specifically found to be decreased in acne comedones and is more directly implicated in the pathology. - While important for skin health, its role in acne is generally less prominent than that of linoleic acid.

Q: Rhinophyma is associated with-

Sebaceous gland hypertrophy. ***Sebaceous gland hypertrophy*** - **Rhinophyma** is a severe form of rosacea characterized by marked thickening and enlargement of the nose, [1] primarily due to **hypertrophy of the sebaceous glands**. - This glandular overgrowth leads to a bulbous, erythematous, and often disfigured appearance of the nose [1]. *Epithelial cell hyperplasia* - While there may be some secondary **epidermal hyperplasia** in rhinophyma, it is not the primary defining feature of the condition. - The dominant histological change is related to the **sebaceous glands** and connective tissue, not mainly the surface epithelium. *Endothelial cell hyperplasia* - **Vascular changes** and **telangiectasias** are common in rosacea, including rhinophyma, indicating some proliferation of endothelial cells [1]. - However, the most prominent and characteristic pathological feature of rhinophyma is the enlargement of the **sebaceous glands**, not the endothelial cells. *Sweat gland hypertrophy* - **Sweat glands** (eccrine or apocrine) are generally not primarily affected or undergo hypertrophy in rhinophyma. - The pathology is specifically centered on the sebaceous glands, which are distinct from sweat glands. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, p. 1176.

Q: Comedones are characteristics of:

Acne vulgaris. ***Acne vulgaris*** - **Comedones** are the hallmark lesions of acne vulgaris, resulting from the obstruction of hair follicles by sebum and keratinocytes. - These can be **open comedones (blackheads)** or **closed comedones (whiteheads)**. *Acne rosacea* - Characterized by **erythema**, **telangiectasias**, papules, and pustules, primarily on the central face. - **Comedones are notably absent** in acne rosacea, which helps differentiate it from acne vulgaris. *Adenoma sebaceum* - This term is a misnomer for **facial angiofibromas**, which are small, red-brown papules, typically found on the nose and cheeks. - These lesions are a characteristic feature of **tuberous sclerosis** and are not comedones. *SLE* - Systemic lupus erythematosus (SLE) is an autoimmune disease with diverse dermatologic manifestations such as the **malar rash (butterfly rash)**, photosensitivity, and discoid lesions. - **Comedones are not a typical feature** of cutaneous manifestations of SLE.

Q: Recalcitrant acne is treated by:

Retinoids. ***Retinoids*** - **Oral retinoids**, particularly **isotretinoin**, are highly effective for **recalcitrant, severe acne** that has not responded to conventional therapies. - They work by reducing **sebum production**, inhibiting **Propionibacterium acnes**, normalizing **follicular keratinization**, and possessing **anti-inflammatory** properties. *Steroids* - **Systemic steroids** are generally not used for long-term acne treatment due to significant side effects and the potential for **steroid-induced acne**. - They may be used short-term for **severe nodulocystic acne** with significant inflammation, but not as a primary treatment for recalcitrance. *Oral erythromycin* - **Oral erythromycin** is an antibiotic sometimes used for acne, but resistance is common, limiting its effectiveness, especially in **recalcitrant cases**. - It primarily targets **Propionibacterium acnes** and has some **anti-inflammatory** effects, but is less potent than retinoids for severe, persistent acne. *Oral tetracycline* - **Oral tetracyclines** (e.g., doxycycline, minocycline) are commonly used for moderate to severe acne, but if acne is **recalcitrant**, it indicates a lack of response to these antibiotics. - Their mechanism involves reducing **bacterial growth** and inflammation, but they do not address the underlying pathogenesis of severe acne as comprehensively as retinoids.

Question 1

Adapalene is used in treatment of:

Accepted Answer

Acne vulgaris

Answer

Atopic dermatitis

Answer

Psoriasis

Answer

All of the options

Question 2

Which is the most commonly prescribed first-line oral antibiotic for moderate to severe acne vulgaris?

Accepted Answer

Minocycline

Answer

Co-triamoxazole

Answer

Penicillin

Answer

Tetracycline

Question 3

A girl about to marry has comedonal acne. Drug to treat such a case is:

Accepted Answer

Retinoids

Answer

Topical antibiotic

Answer

Estrogen

Answer

Benzoyl peroxide

Question 4

Rhinophyma is a condition characterised by which of the following?

Accepted Answer

Hyperplasia of sebaceous glands

Answer

Perioral dermatitis

Answer

Sweat gland hypertrophy

Answer

Butterfly rash on the nose

Question 5

Which of the following are treatment options for acne vulgaris?

Accepted Answer

All of the options

Answer

Isotretinoin

Answer

Topical erythromycin

Answer

Oral Minocycline

Question 6

Acid that is decreased in acne comedones is?

Accepted Answer

Linoleic acid

Answer

Palmitic acid

Answer

Linolenic acid

Answer

Acetic acid

Question 7

Which of the following best describes the current understanding of rosacea pathogenesis?

Accepted Answer

Multifactorial etiology with no single definitive cause established

Answer

Primarily caused by increased sebum production similar to acne vulgaris

Answer

Solely due to increased reactivity of cutaneous blood vessels to vasodilators

Answer

Results from bacterial infection affecting the entire face and back

Question 8

Rhinophyma is associated with-

Accepted Answer

Sebaceous gland hypertrophy

Answer

Epithelial cell hyperplasia

Answer

Endothelial cell hyperplasia

Answer

Sweat gland hypertrophy

Question 9

Comedones are characteristics of:

Accepted Answer

Acne vulgaris

Answer

Acne rosacea

Answer

Adenoma sebaceum

Answer

SLE

Question 10

Recalcitrant acne is treated by:

Accepted Answer

Retinoids

Answer

Steroids

Answer

Oral erythromycin

Answer

Oral tetracycline

Acne and Related Disorders — MCQs

Acne and Related Disorders — MCQs

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