Bernard A. Cohen, MD

You are asked to evaluate a healthy 1.5-day-old girl who has a congenital red patch with coarse telangiectasias and a surrounding ring of pallor on the right shoulder. What's your diagnosis?

A 17-year-old male patient presents with multiple lesions developed on his trunk, face, and extremities that had previously been solitary, red expanding lesion on his right arm at the site of a tick bite that occurred during a hike.

Tinea incognito is a dermatophyte infection that has been altered by use of topical or systemic corticosteroids. It lacks the classic features of a ringworm infection due to corticosteroid suppression of inflammation and altered local immune response.

A 9-year-old boy has developed an itchy vesicular rash on his left leg that has spread to his other leg and to both arms and hands. What is the diagnosis?

A boy with a history of skin eruption, intermittent fever, and generalized weakness now has red bumps on the bony prominences of his hands, elbows, and knees. What's the diagnosis?

Self-healing reticulohistiocytosis