CANS Skincare & Dermatological Treatments Flashcards

Which SPF rating is the minimum recommended by US dermatology guidelines for daily photoprotection in aesthetic patients?

Answer: SPF 30

The American Academy of Dermatology recommends a minimum of SPF 30 for broad-spectrum daily sun protection.

What distinguishes physical (mineral) sunscreens from chemical sunscreens in mechanism of action?

Answer: Physical sunscreens reflect and scatter UV; chemical sunscreens absorb UV and convert it to heat

Mineral sunscreens (zinc oxide, titanium dioxide) sit on the skin surface and physically reflect/scatter UV radiation, while chemical filters absorb UV energy and dissipate it as heat.

A patient develops a contact dermatitis reaction 48 hours after a new skincare product. This is most consistent with which type of hypersensitivity reaction?

Answer: Type IV (delayed-type / T-cell mediated)

A 48-hour delayed reaction to a topical agent is characteristic of Type IV delayed-type hypersensitivity, mediated by sensitized T-cells.

Which skin condition is characterized by symmetric erythematous papules and pustules on the central face, often exacerbated by heat and spicy foods?

Answer: Rosacea

Rosacea presents with centrofacial erythema, papules, and pustules, and is commonly triggered by heat, spicy food, alcohol, and sun exposure.

When performing microneedling, what depth setting is most appropriate for treating superficial fine lines and improving skin texture?

Answer: 0.5–1.5 mm

A depth of 0.5–1.5 mm creates controlled micro-injuries in the dermis to stimulate collagen without significant downtime.

Which topical anesthetic formulation is commonly applied before aesthetic procedures to reduce patient discomfort?

Answer: EMLA cream (lidocaine 2.5% + prilocaine 2.5%)

EMLA cream combines lidocaine and prilocaine and is the most widely used topical anesthetic for pre-procedure skin numbing in aesthetics.