Dermatology

Fluid-filled blisters; necrobiosis lipoidica; gestational diabetes mellitus . . . Test your knowledge on these and other subjects in this quiz.

Fact check on this common disorder…

How much do you know about erythema annulare centrifugum?

A 67-year-old woman noted the appearance of several non-tender, rock-hard, purple-colored nodules on her legs. Her medical history was significant for distant non-Hodgkin lymphoma. The violaceous color and configuration of the skin lesions suggests which of the following?

Allergic contact dermatitis is common, can be debilitating for patients, and may mimic other dermatoses.

Scaling erythema; Epstein-Barr virus infection; one blue, one brown iris . . . test yourself with this 5-question quiz.

A 56-year-old woman presents with pruritic skin lesions on the arms and legs. What does this pattern suggest?

A new tender lesion in a man with T2 diabetes; hypertension and gout; TMJ osteochondroma . . . your answers to questions on these and other maladies?

Pseudosac with ectopic pregnancy, palmar erythema, pemphigoid gestationis, abdominal wall hematoma, dermatomyositis, livedo reticularis-visual presentations of health problems that occur frequently, or exclusively, in women.

A 45-year-old woman had painless, red, crusted papules on the hand. There was no history of trauma. The patient had a home aquarium. Your diagnosis?

A new dark spot on the forehead; overprescribing of benzodiazepines; alcohol and atrial fibrillation . . . can you answer the quiz questions on these topics?

Polycystic ovary syndrome, “dermatoses of pregnancy,” systemic sclerosis, subacute cutaneous lupus erythematosus, gallbladder agenesis, sarcoidosis-a close look at medical problems seen frequently in women.

A 46-year-old woman presented with the new onset of a slightly stinging and burning, expanding patch on the upper abdominal skin. Your diagnosis?

Fewer than two-thirds of men know the signs of skin cancer and the younger they are the less likely they are to believe they are at risk for the disease, according to a national survey.

Tinea versicolor presents with hyperpigmented and hypopigmented coalescing thin scaly plaques and macules.Typically they appear on the trunk and the upper back. It is more common in warm humid climates.

These asymptomatic plaques developed on the legs of a 59-year-old woman with diabetes mellitus and pulmonary sarcoidosis. Biopsy showed a granulomatous infiltrate of epithelioid histiocytes and multinucleated giant cells surrounded by lymphocytes “layered” throughout the dermis. What’s your diagnosis?

Is this lesion a skin cancer? Does organophosphate poisoning cause syncope? How is tinea pedia complex best treated? Try your hand at this week’s quiz questions.

This man had been taking vancomycin and piperacillin/tazobactam for 3 weeks for osteomyelitis. What does the rash look like to you?

The rash has been present for 2 years. Originally on the trunk and extremities it has now spread to her face and hands. She has been diagnosed as having and been unsuccessfully treated for nummular eczema and tinea corporis. What's your Dx?

Lichen spinulosus is a rare, hyperkeratotic dermatosis similar to keratosis pilaris. It is most common in children, adolescents, young adults with male predominance. Treatment includes keratolytics and emollients.

The asymptomatic atrophic brown plaques on this woman’s legs were diagnosed as necrobiosis lipoidica. The differential diagnosis included lupus erythematosus and granuloma annulare.

Polymorphic light eruption, phototoxicity, solar purpura, basal cell carcinoma, squamous cell carcinoma, keratoacanthoma, venous lakes, photosensitivity-a look at the many adverse effects of too much sun exposure.

A 6-year-old boy had a 1-month history of an intensely pruritic “rash” on the left dorsal foot and left lower leg. He had a recent history of walking barefoot on a beach in south Florida where dogs are allowed. What's your diagnosis?

This week’s quiz questions challenge you to determine the cause of an infant’s “strange breathing” based on a chest film, to come up with the most common cause of chronic cough in children, to be a dermatologic detective, among other things.

A 4-year-old, previously healthy girl presented with large, tense bullae involving up to 40% of her body surface area. Her parents described a 12-day history of itchy, papulovesicular lesions that had progressed into large blisters. Your dx?

A toddler from Nigeria, whose parents remained there ill with AIDS, presented with a fever and a widespread itchy eruption. Tests for HIV infection were positive. Which systemic etiologies can be ruled out when such an eruption presents?

Erythema migrans, the characteristic rash of Lyme disease, often has a bull’s-eye appearance. Which of the following additional factors can help the diagnosis?

Meet patients’ facial skin problems head-on by gaining a familiarity with the common problems and symptoms. This week’s photo quiz offers a variety of presentations to test your prima facie knowledge.

A 60-year-old Caucasian man with a history of invasive squamous cell carcinoma of the lung presents with the lesions shown. Metastases to the skin can be a clinical finding in many malignancies.

This patient with type 1 diabetes noted a painful erosion at the site of tattoo she had gotten several days earlier. What's the most likely cause?