Round Red Patch on a Man's Neck

A 68-year-old woman presents with a new 6-mm nodule with central ulceration and a rolled border on the right cheek. What's your diagnosis? How would you treat?

Patient claims pruritic full-body rash is from a course of vancomycin. Is he correct? Could it be something else?

Patient is 54 y/o man; the cough has been present for 2 weeks, the rash on the lower extremities for 2 months; the rash is getting worse. What's your dx?

Guttate and other psoriasis may be confused with other rashes and skin lesions. Scratch the surface of your knowledge with this crash quiz.

Here are key clues: an intensely pruritic rash on the lower legs that developed within hours after the patient walked through a grassy field near a lake.

Test your knowledge of the products of climate change and the health effects they may have.