Dermatology

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?

Lyme disease and other tick-borne illnesses occur most often in the late spring and summer months, many with similar presentations, making this a good time to test your knowledge of these pesty posers.

This firm exquisitely tender mass developed after the 77-year-old woman fell a few days earlier. She had a history of an embolic cerebral stroke, for which she takes warfarin. Your Dx?

Many skin disorders look alike, and psoriasis can be especially tough to diagnose. Take this photo quiz to test your knowledge of these similar syndromes.

Diagnosing and managing infectious diseases can be challenging. This week’s photo quiz offers a variety of presentations to test your acumen.

This chronic, autoimmune, subepidermal disease mostly affects older persons. Marked by spontaneous remissions and exacerbations, it manifests with tense blisters that usually start on the arms and legs. Your dx?

A 9-year-old boy presented with a 1-week history of pruritus and rash on his elbows, knees, back, and legs. He had recently run through a field of tall grass but denied any other exposure history. Your Dx?

Many medical problems are common to both men and women, but several occur more frequently in women. This week’s photo quiz tests your knowledge of a variety of these disorders.

This 66-year-old black woman presented with a 2-year history of a painless skin eruption. She stated that her skin had “changed overnight” while she was caring for her mother who had been hospitalized. Your diagnosis?

This lesion, present for 4 months, had not responded to oral nystatin or fluconazole. Multiple, nontender, whitish, vertical striations were noted along its right lateral edge. Your dx?

Patients frequently present with hand disorders, and the hands often show changes that reflect a disease that affects other parts of or the whole body. This week’s photo quiz offers several presentations to test your knowledge.

An otherwise healthy 24-year-old man is concerned about this mildly pruritic, scaly rash on his chest, which erupted during the late spring. What do you suspect is the diagnosis?

As the incidence of malignant melanoma continues to rise, so does primary care physicians’ need to identify pigmented lesions for early detection. Take a look at these presentations to test your knowledge.

A 42-year-old woman, who has a family history of non-melanoma skin cancer, is worried about these 2 small yellowish papules on her forehead. Can you identify these lesions?

Five days after starting a new medication, this lesion appeared on a man’s neck. It slowly resolved after the drug was stopped. Which of these drugs do you suspect might have caused the lesion?

For at least 3 months, this asymptomatic nodule has been slowly growing on a 63-year-old man's finger. What are you looking at here?

The patient's medical history was notable for hypertension, diabetes mellitus, and seizure disorder. Here, find images and lab results; then select a diagnosis.

The patient was treated with a combination of topical corticosteroids, oral retinoids, and psoralen with ultraviolet A (PUVA) therapy, with significant improvement in his symptoms over time.

A 76-year-old woman seeks your attention for an asymptomatic “red spot” on her neck. What does this look like to you?

Many medical disorders occur more frequently in the cold, dry weather of the winter season. Take this week’s photo quiz to test your knowledge of these hazardous conditions.

This teen has had violaceous papules, petechiae, and healing ulcerations on the distal digits of both hands and feet for about a month this winter as well as intermittent shortness of breath since she moved to the northeast from the Caribbean. What's in your differential?

The young female presented with a 1-month history of violaceous papules, petechiae, and healing ulcerations on the distal digits of both hands and feet.

Recent travel to the Caribbean is the key clue that led to the diagnosis of dengue fever, which caused maculopapular rash, fever, headaches, and body aches.

Here, 3 slide shows that were the most popular of our weekly offerings in 2013. Have a go at the quiz questions and see how well you do.

Small and nondescript, subungual splinter hemorrhages should prompt further investigation.