A man with a rapidly evolving, widespread pruritic rash.

The article focuses on a case presentation of a 21-year-old man with a rapidly evolving, widespread pruritic rash. The differential diagnoses discussed include pityriasis rosea, viral exanthems, tinea corporis, secondary syphilis, and guttate psoriasis, with the latter being the correct diagnosis. It also covers the pathophysiology, diagnosis and management of guttate psoriasis.