Derm Dx: Itchy Rash Following an Injection
A woman presents with an itchy rash on her arm that she reports developed after receiving a subcutaneous injection of a biologic agent.
Case Studies
Derm Dx: Pruritic, Erythematous Papules and Nodules
A man presents with multiple erythematous papules and nodules on his chest, arms, and upper back.
Derm Dx: Asymptomatic Plaque on the Jaw
A fair-skinned, elderly woman presents for evaluation of a skin lesion on her left jaw.
Derm Dx: Large Hyperpigmented Patch With Hypertrichosis
A patient presents with a large hyperpigmented patch with increased hair growth that began developing on his upper chest and neck around puberty.
Derm Dx: Red Lesion on the Cheek
An infant is brought to the dermatologist for evaluation of a red lesion on her cheek.
Erythematous Plaques With Scaling
A man with a 15-year smoking history presents with well-demarcated erythematous plaques with scale on his ears, arms, and cheeks.
Erythematous, Eczematous, and Pruritic Lesions With Lichenification
A 41-year-old man presents with a 3-year history of progressively worsening generalized erythematous, eczematous, and pruritic skin lesions along with lichenifications of the flexural surfaces.
Annular Erythematous Plaque
A 29-year-old white man presents with a 10-day history of a scaly, pruritic lesion on his right posterior thigh. His medical and family histories are unremarkable. On examination, the lesion is an annular erythematous plaque with trailing scale. The polycyclic plaque has a central clearing. Biopsy is performed, the results of which show a dense…
Circumscribed Hyperpigmented Lesions
A 10-year-old child presents for evaluation of a 5-day history of lesions on the hands. Examination reveals multiple circumscribed, hyperpigmented lesions. The lesions appeared 12 hours after the patient took oral ibuprofen for fever. Three months earlier, identical lesions appeared in the same locations after the patient took the same medication for 3 days. This…
Derm Dx: Thick Mass on the Posterior Neck
A man presents with a mass on the back of his neck that limits his range of motion and causes discomfort.
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