Herpes Zoster

Pain often precedes the rash in a majority of patients; it is typically distributed in a dermatomal fashion and is usually restricted to one dermatome, with possible involvement of adjacent dermatomes.  The patients describe the pain as “burning,” “throbbing,” or “stabbing.”  Typically the rash is grouped herpetiform vesicles developing on the erythematous base.  It may… Read more »

Petechia, Purpura, & Vasculitis

Here is a link to a PDF document from UCSF Medical School reviewing palpable purpura. It’s a good review for a non-dermatologist. Take a look . . . Petechia, Purpura,  and Vasculitis

Scabies

Patients frequently present with intense itching generally at night (also check for bed bugs) associated with a “rash.” A short elevated pink and tortuous line, or serpiginous track in the superficial epidermis, with a small vesicle at the tip is known as a burrow; this is pathognomonic of scabies. Treatment: Treat everyone simultaneously Bed linen… Read more »

Livedo Reticularis

When you see this in a question, think of Athreroemboli Vasculitis (SLE) Hyperviscosity Syndrome (Antiphospholipid Syndrome) If you see it in a patient, it’s probably nothing . . . unless there are associated symptoms of pain or ulcer development.

Basal Cell Carcinoma & Lesions of Similar Appearance

Features of Basal Cell Carcinoma and Lesions of Similar Appearance Lesion Location Surface Color Outline Other features Basal cell carcinoma Most common on face, but can occur anywhere Raised, pearly, firm Normal skin color Round at first, irregular later May ulcerate Superficial basal cell carcinoma Any location Roughened Skin-colored or pink Round or irregular Resembles… Read more »

Squamous Cell Carcinoma & Lesions of Similar Appearance

Features of Squamous Cell Carcinoma and Lesions of Similar Appearance   Lesion Location Surface Color Outline Other features Squamous cell carcinoma Areas exposed to sunlight, radiation or arsenicals Rough, irregular, sometimes scaly, sometimes has visible vessels, sometimes warty or with fleshy masses Skin-colored at first, sometimes reddened later Vague New lesions may appear near old… Read more »

Molluscum Contagiosum

Transmission of molluscum contagiosum has been reported by direct skin contact and has occurred in wrestlers, patients of a surgeon with a hand lesion, and children sharing baths, towels, gymnasium equipment, and benches. Autoinoculation also occurs as evidenced by linear arrays of lesions on infected individuals. Molluscum contagiosum can likely be vertically transmitted, similarly to other… Read more »