Two patients present with similar cutaneous growths—one a series of ulcerative lesions on the lower leg, and the other a painless forearm lesion.

Two boys present with similar hair loss—one developed only months earlier, the other had been present since birth.

Two patients with enlarging lesions—one in a man with no history of skin cancer, and the other in a man with significant actinic damage.

Differing purple eruptions in two patients: one presents with a dimpled papule on the leg and the second with a pruritic, polished lesion on the penile shaft.

In our first patient, a leg rash developed after starting cefazolin. Our second patient presented with reddish papules and plaques on the legs. Skin biopsy confirmed hemosiderin deposits in the upper dermis. What's your diagnosis?

Two young girls presented with hypopigmented patches—one on the right buttock, the other on the knees, fingers, and ankles.

Can you distinguish between similar plaques? Our dermatologic look-alike may stump you.

Two women present with growing scalp nodules. One patient had a nodule that was increasing in size, though not pruritic or painful. The other patient reported unintentional weight loss....

Sun exposure is the common link between these two conditions. Can you tell them apart?

Two men present with red rashes—one started on the back and spread to the upper arms, and the other was limited to the chest.