Keratolytics and Emollients — MCQs
All trans retinoic acid is used topically for -
Pompholyx affects:
Adapalene is used in treatment of:
Assertion: Vitamin D analogues are effective in psoriasis. Reason: They reduce keratinocyte proliferation
Acid that is decreased in acne comedones is?
Recalcitrant acne is treated by:
Which of the following is the most common side effect of Isotretinoin used for acne vulgaris?
23 years old woman complains of recurrent acne over her face. History revealed that she had taken topical antibiotics for her acne without any significant improvement. Which one of the following tetracyclines is most preferred for her acne?
Ichthyosis is a side effect of -
Podophyllum resin is indicated in the treatment of:
Keratolytics and Emollients Indian Medical PG Practice Questions and MCQs
Question 1: All trans retinoic acid is used topically for -
- A. Lupus vulgaris
- B. Alopecia areata
- C. Acne vulgaris (Correct Answer)
- D. Androgenic alopecia
Explanation: ***Acne vulgaris*** - **All-trans retinoic acid (tretinoin)** is a topical retinoid that is highly effective in treating **acne vulgaris** by normalizing follicular keratinization, reducing sebum production, and possessing anti-inflammatory properties. - It helps in preventing the formation of new **comedones** and promoting the clearance of existing lesions. *Lupus vulgaris* - **Lupus vulgaris** is a cutaneous form of **tuberculosis**, typically treated with multidrug antitubercular therapy. - Retinoic acid is **not a primary treatment** for this condition. *Alopecia areata* - **Alopecia areata** is an autoimmune hair loss condition, often treated with **topical or intralesional corticosteroids**, or immunomodulators. - Topical retinoic acid is **not indicated** for its treatment. *Androgenic alopecia* - **Androgenic alopecia (male or female pattern baldness)** is primarily treated with **topical minoxidil** or **oral finasteride**. - While retinoids can stimulate hair growth, they are **not a first-line treatment** for androgenic alopecia and are sometimes used as an adjuvant to minoxidil.
Question 2: Pompholyx affects:
- A. Groin
- B. Scalp
- C. Trunk
- D. Palms and soles (Correct Answer)
Explanation: ***Palms and soles*** - **Pompholyx**, also known as **dyshidrotic eczema**, is characterized by recurrent outbreaks of **vesicles and bullae** predominantly on the palms and soles. - These lesions are typically very **itchy** and can cause significant discomfort. *Groin* - Conditions like **tinea cruris** (jock itch) or **intertrigo** commonly affect the groin, presenting with erythema and scaling rather than vesicles. - While eczema can occur in the groin, classical pompholyx has a predilection for the acral regions. *Scalp* - The scalp is more commonly affected by conditions such as **seborrheic dermatitis** or **psoriasis**, which manifest as scaling, redness, and flaking. - Vesicular eruptions are rare on the scalp unless due to specific conditions like herpes zoster. *Trunk* - The trunk is a common site for various dermatoses, including **atopic dermatitis**, **psoriasis**, or **pityriasis rosea**, but these typically present with different morphologic features (e.g., plaques, patches). - Pompholyx is specific to palms and soles and does not usually involve the trunk.
Question 3: Adapalene is used in treatment of:
- A. Atopic dermatitis
- B. Psoriasis
- C. Acne vulgaris (Correct Answer)
- D. All of the options
Explanation: **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.
Question 4: Assertion: Vitamin D analogues are effective in psoriasis. Reason: They reduce keratinocyte proliferation
- A. Both A & R true, R explains A (Correct Answer)
- B. A false R true
- C. Both A & R true, R doesn't explain A
- D. A true R false
Explanation: ***Both A & R true, R explains A*** - **Vitamin D analogues** (e.g., calcipotriol) are a cornerstone treatment for psoriasis because they effectively modulate **keratinocyte proliferation** and differentiation. - Psoriasis is characterized by the **rapid overgrowth of keratinocytes**, and the antiproliferative effects of vitamin D analogues directly address this pathological hallmark. *A false R true* - This option is incorrect because both the assertion (Vitamin D analogues are effective in psoriasis) and the reason (They reduce keratinocyte proliferation) are individually true. - The effectiveness of vitamin D analogues in treating psoriasis is well-established in dermatological practice. *Both A & R true, R doesn't explain A* - This option is incorrect because the reduction of keratinocyte proliferation is precisely *how* vitamin D analogues exert their therapeutic effect in psoriasis. - The mechanism of action described in the reason directly explains the efficacy mentioned in the assertion. *A true R false* - This option is incorrect because the reason ("They reduce keratinocyte proliferation") is a fundamental and well-understood mechanism by which vitamin D analogues work in psoriasis. - Vitamin D analogues bind to vitamin D receptors in keratinocytes, influencing gene expression to inhibit their excessive growth.
Question 5: Acid that is decreased in acne comedones is?
- A. Palmitic acid
- B. Linolenic acid
- C. Acetic acid
- D. Linoleic acid (Correct Answer)
Explanation: ***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.
Question 6: Recalcitrant acne is treated by:
- A. Steroids
- B. Retinoids (Correct Answer)
- C. Oral erythromycin
- D. Oral tetracycline
Explanation: ***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 7: Which of the following is the most common side effect of Isotretinoin used for acne vulgaris?
- A. Xerosis
- B. Hair loss
- C. Facial erythema
- D. Cheilitis (Correct Answer)
Explanation: ***Cheilitis*** - **Cheilitis** (dry, cracked lips) is the most frequently reported side effect due to the drug's effect on sebaceous glands and subsequent reduction in sebum production. - This symptom affects nearly all patients on isotretinoin therapy. *Xerosis* - While **xerosis** (dry skin) is a common side effect of isotretinoin, it is typically less pervasive and severe than cheilitis. - Patients often experience generalized skin dryness, but it usually doesn't affect all patients to the same degree as labial dryness. *Hair loss* - **Hair loss** (alopecia) is a known but less common side effect, usually mild and reversible upon discontinuation of the drug. - It does not affect the majority of patients undergoing isotretinoin treatment. *Facial erythema* - **Facial erythema** (redness) can occur due to skin sensitivity and dryness, but it's not as universal or prominent as cheilitis. - It is more of an indirect effect of the drug, rather than a direct and universal consequence of its mechanism of action.
Question 8: 23 years old woman complains of recurrent acne over her face. History revealed that she had taken topical antibiotics for her acne without any significant improvement. Which one of the following tetracyclines is most preferred for her acne?
- A. Doxycycline (Correct Answer)
- B. Oxytetracycline
- C. Minocycline
- D. Demeclocycline
Explanation: ***Doxycycline*** - **Doxycycline** is a commonly preferred tetracycline for acne due to its **anti-inflammatory properties** and efficacy against *P. acnes* at sub-antimicrobial doses. - Its **longer half-life** allows for once-daily dosing, improving patient adherence compared to other tetracyclines. *Oxytetracycline* - While effective against *P. acnes*, **oxytetracycline** generally requires higher doses and more frequent administration, which can lead to poorer patient compliance. - It often causes **gastric irritation**, making it less favorable for long-term acne management. *Minocycline* - **Minocycline** is also effective for acne but is associated with a higher risk of **side effects** like dizziness, headache, and hyperpigmentation (e.g., skin, teeth). - Its potential for **drug-induced lupus-like syndrome** and **hepatotoxicity** makes it less preferred compared to doxycycline, especially for prolonged use. *Demeclocycline* - **Demeclocycline** is primarily used as an **ADH antagonist** for treating syndrome of inappropriate antidiuretic hormone (SIADH) and is not a first-line treatment for acne. - It has a higher incidence of **photosensitivity** and overall greater renal toxicity compared to other tetracyclines, making it unsuitable for acne.
Question 9: Ichthyosis is a side effect of -
- A. Capreomycin
- B. Letrozole
- C. Clofazimine (Correct Answer)
- D. Cephalosporin
Explanation: ***Clofazamine*** - **Clofazimine** is an antimycobacterial drug used to treat **leprosy**, and one of its characteristic skin-related side effects is **ichthyosis**, presenting as dry, scaly skin. - It accumulates in fatty tissues and the reticuloendothelial system, causing a range of skin pigmentation changes from red-brown to black, often associated with generalized dryness and scaling. *Capreomycin* - **Capreomycin** is an injectable antibiotic primarily used for **multi-drug resistant tuberculosis (MDR-TB)**. - Its main side effects involve **nephrotoxicity** and **ototoxicity**, not ichthyosis. *Letrozole* - **Letrozole** is an **aromatase inhibitor** used in the treatment of **hormone-receptor-positive breast cancer** in postmenopausal women. - Common side effects include **hot flashes**, **arthralgia**, and **fatigue**, but not ichthyosis. *Cephalosporin* - **Cephalosporins** are a class of **beta-lactam antibiotics** widely used for bacterial infections. - While they can cause various side effects like **allergic reactions** (rash, anaphylaxis), **gastrointestinal upset**, and **nephrotoxicity** at high doses, ichthyosis is not a recognized side effect.
Question 10: Podophyllum resin is indicated in the treatment of:
- A. Pemphigus.
- B. Psoriasis.
- C. Condyloma acuminata. (Correct Answer)
- D. Condylomata lata.
Explanation: ***Condyloma acuminata.*** - **Podophyllum resin** is a cytotoxic agent that inhibits cell division and is commonly used as a topical treatment for **genital warts (condyloma acuminata)**. - Its mechanism involves arresting cells in metaphase by interfering with microtubule assembly, leading to necrosis of the wart tissue. *Pemphigus.* - **Pemphigus** is an autoimmune blistering disease of the skin and mucous membranes, not treated with podophyllum resin. - Treatment typically involves **systemic corticosteroids** and other immunosuppressive agents. *Psoriasis.* - **Psoriasis** is a chronic inflammatory skin condition characterized by accelerated epidermal cell turnover, and **podophyllum resin is not indicated for its treatment**. - Management often includes topical corticosteroids, vitamin D analogs, phototherapy, and systemic immunomodulators. *Condylomata lata.* - **Condylomata lata** are broad, flat, moist lesions characteristic of **secondary syphilis**, and they are highly infectious. - Treatment involves **penicillin** for syphilis, as condylomata lata are a manifestation of the underlying spirochete infection.
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