Skin Diseases

This is a very distinct, rare, and remarkable hemorrhagic rash, first recognized in 2006, with 7 known cases reported in the literature.

This diagnosis is a relative dermatologic emergency; presumptive treatment with antivirals should at least be considered if any suspicion exists.

What figures into your differential of a slowly enlarging asymptomatic plaque, like the one on this child's hand?

A patient with a history of moderately severe and extensive plaque psoriasis now has a rash on her hands unlike any skin problem she has previously experienced. Do you know what this is? Answer this question and 4 others in this quiz.

This lesion began to develop multiple colors. Is there cause for concern? Test your knowledge on 5 topics in this quiz.

This benign, solitary, nodular tumor on the lower eyelid arises from the follicular infundibulum. What do you know about this condition and the 4 others in this quiz?

This tongue-twister of a dermatosis is the most common type seen during pregnancy and primarily occurs in women carrying twins or triplets.

This 13-year-old boy presents with hyperpigmented skin on his neck. He is 66.75 inches and weighs 232 pounds. Your suspicion?

These discolored, scaly lesions on this young man’s trunk have recurred for the past 2 summers. He reports that the rash becomes “irritated and itchy” when he is in the sun.

You might not think of sarcoidosis in this patient’s case, but that’s the point. Here: teaching points about a disease not to be missed.

This afebrile baby presents with a target-shaped, centripetal rash. He has been taking amoxicillin for 5 days for an ear infection.

This asymptomatic, hyperpigmented lesion was first noted 5 years earlier on the left upper back of a 16-year-old boy. A nevus? Cafe au lait spot?

This monomorphic papular rash is unrelated to medications, recent sickness, or exposure to poison oak. It developed about 6 days earlier.

This highly pruritic rash has been present for about 2 weeks. The teen says he believes it is spreading. What's your diagnosis?

Abrasions, ecchymoses, and a 3-cm laceration led to infection with Morganella morganii. What do you know about this pathogen? In this quiz: questions on wounds that resulted from falls.

Patients with dermatitis herpetiformis should be referred for consultation with a gastroenterologist for evaluation and follow-up.

This rash began as a small red patch about 10 days earlier while the patient was at wrestling camp.

Does this rash look like impetigo? Herpes? Tinea? Cellulitis? Here's a close look and a link to the answer and discussion.

Dermatofibromas may present as papules or nodules that are elevated or slightly depressed. Suspected etiology includes skin injury such as insect bites.

This self-limited albeit recurrent condition is often triggered by antigenic stimuli, including infections, most often HSV, and medications.

Bumps on the face; opioids and alcohol; dysmorphic facial features in 6-month-old boy . . . questions on these and other topics in this quiz.

The key diagnostic clue: it looks like she tried to wipe grease off her hands, but didn’t succeed.

A 58-year-old man asks about this painless lesion on his left third digit. It does not itch, burn, or sting and there are no other similar lesions. He had a history of basal cell carcinoma on the arm and several more recent actinic keratoses on his scalp. What’s your diagnosis?

This annular violaceous plaque, which had been present for a few months, was unresponsive to treatment for tinea corporis with topical antifungals. Which of the following statements is true?

A 66-year-old woman had a mildly pruritic rash on the buttocks, lower back, abdomen, and upper posterior thighs. The eruption had been present for approximately 18 months. Your diagnosis?

Thyroglossal duct cyst; HCV-HIV coinfection; slurred speech and trouble swallowing and chewing . . . see how well you do on the quiz questions this week.

This relatively uncommon inflammatory dermal process has previously been associated with diabetes mellitus and more recently with hyperlipidemia.

Allergic contact dermatitis, drug-induced hypersensitivity syndrome, Stevens-Johnson syndrome, metastases to the skin, tinea versicolor, lichen spinulosus-a look at cutaneous conditions and their underlying causes.

This relatively small (1 cm), pigmented nodule of uncertain duration was noticed on the left arm of a 57-year-old man with a history of skin cancer. What do you suspect here?

Mycosis fungoides; circumscribed erythematous lesions in a toddler; large abdominal ecchymotic mass . . . some of the challenges for you in this quiz.