Condition	Characteristics
Erythema multiforme	Targetoid or ringlike lesions on the extremities, with occasional involvement of the palms and soles; various stages of healing
Secondary syphilis	Maculopapular rash involving the trunk and extremities, including the palms and soles; rash develops after the appearance of the painless primary genital chancre
Septic emboli	Palpable purpura, petechiae, and nodular lesions (Osler nodes and Janeway lesions)
Stevens-Johnson syndrome	Full-thickness desquamation and mucocutaneous blistering; purpuric papules that progress to epidermal necrosis
Subacute cutaneous lupus	Erythematous macules or plaques on sun-exposed skin; progression to hyperkeratotic papulosquamous or annular plaques, with gray-white hypopigmentation and telangiectasis