An individual using a sharp knife notices a small amount of blood where he just cut himself. Which of the following layers of skin did he have to cut into in order to bleed?

Correct Answer: C

Rationale: Bleeding occurs when blood vessels are cut, and these are located in the papillary dermis, below the avascular epidermis.

Correct Answer: A

Rationale: Incontinentia pigmenti is an X-linked dominant disorder, lethal in males (not females), and associated with skin lesions (streaks/vesicles), alopecia, hypodontia, microphthalmos, and seizures. Lethality in females is incorrect.

Correct Answer: D

Rationale: Tinea corporis (caused by dermatophytes) typically does not fluoresce under Wood lamp unless specific species are present, but most common forms show no fluorescence, matching D.

Correct Answer: D

Rationale: A, B, and C are true: topical corticosteroids relieve itching, fluorinated ones are more potent with more side effects. D is false as potency varies, not just formulation.

Correct Answer: D

Rationale: Laser therapy (e.g., pulsed dye laser) is the standard treatment for port-wine stains, targeting vascular lesions effectively.