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Bernard A. Cohen, MD

Bernard A Cohen, MD, is the section editor for Dermcase and professor of pediatrics and dermatology, Johns Hopkins University School of Medicine, Baltimore, Maryland.


Just a little birthmark?

November 09, 2022

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?

Disseminated erythema migrans as a result of Lyme disease

March 05, 2021

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.

Balancing the scales

February 01, 2008

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.

Linear rash leaves your patient itching

October 01, 2006

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?

Weeks of weakness, then reddish bumps on prominences

September 01, 2006

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?

Pediatric dermatology: What's your Dx?

October 01, 2002

Self-healing reticulohistiocytosis