Skin Disorders Guide

Diagnostic Hallmarks

Distribution: chest, back, and shoulders
Sharp margination
Confluence of central lesions; peripheral satellite macules
Fine scale visible only with scraping
Positive potassium hydroxide (KOH) preparations

Clinical Presentation
The word “versicolor” means various colors. On sun-exposed surfaces the lesions are usually white, but on covered areas they are often light brown or brown-red. The initial lesions of tinea versicolor are sharply [...]

Diagnostic Hallmarks

Distribution: anterior shins
Violaceous border
Central atrophy or ulceration

Clinical Presentation
Necrobiosis lipoidica diabeticorum (NLD) occurs as one or more yellow plaques on the anterior lower legs. Rarely, lesions may be found on the arms, face, and dorsal surface of the feet. Most of the plaques are 2 to 10 cm in diameter. The center of the plaque [...]

Anaphylaxis, is a medical emergency characterized by the sudden onset of urticaria, angioedema, dyspnea, and hypotension. It is most commonly encountered :1fter the administration of penicillin or the ingestion of shellfish or nuts in persons who have specific IgE antibodies attached to their mast cells as a result of previous sensitization.
The physical urticmias include cholinergic [...]