Dermatologist Certificate Dermatopharmacology and Topical Therapy

Question 1

Which topical retinoid is considered the gold standard for treating photodamage and acne?

Accepted Answer

Tretinoin (all-trans retinoic acid)

Answer

Tretinoin is the prototypical topical retinoid with the strongest evidence base for treating acne, photodamage, and fine wrinkles by modulating keratinocyte differentiation and stimulating collagen.

Question 2

What is the vehicle that determines the potency classification of topical corticosteroids?

Accepted Answer

The formulation (ointment > gel > cream > lotion > solution) significantly affects potency

Answer

The same corticosteroid molecule can have different potency classes depending on the vehicle — ointments provide the greatest occlusion and skin penetration, followed by gels, creams, and lotions.

Question 3

Calcineurin inhibitors (tacrolimus and pimecrolimus) are used as steroid-sparing agents for which condition?

Accepted Answer

Atopic dermatitis, especially on the face and intertriginous areas

Answer

Topical calcineurin inhibitors block T-cell activation and are indicated for atopic dermatitis, particularly as steroid-sparing agents for sensitive areas like the face and skin folds.

Question 4

What is the primary mechanism by which benzoyl peroxide treats acne?

Accepted Answer

Releases free oxygen radicals that are bactericidal against Cutibacterium acnes

Answer

Benzoyl peroxide is bactericidal against C. acnes through the release of reactive oxygen species, and critically, it does not induce antibiotic resistance.

Question 5

Which topical medication is first-line treatment for rosacea-associated papulopustular lesions?

Accepted Answer

Metronidazole 0.75–1% gel or cream

Answer

Topical metronidazole is first-line therapy for inflammatory rosacea, reducing papules, pustules, and erythema through anti-inflammatory and antiparasitic (anti-Demodex) mechanisms.

Dermatologist Certificate Practice Test

Dermatologist Certificate Practice Test

Dermatologist Certificate Dermatopharmacology and Topical Therapy