Derm Dx: Purple patches on the palms and soles

A 22-month-old patient presents with a rash on his palms and soles. His mother states the eruption began abruptly two days ago. She describes the skin as erythematous, “beet red,” and says the skin feels very rough, thick and slightly warm.

The child is otherwise healthy and takes no medications. The mother thinks that the child may have ...