History and exam

Key diagnostic factors

common

acute to subacute recurrent skin eruption

Clinical history of recurrent rash.[1]

polymorphic, generalized, nonpruritic skin eruption

Typical finding of the condition and lesions show a predilection for the anterior trunk, flexural surfaces, and proximal extremities.[1]

Other diagnostic factors

common

scars or pigment changes

If recurrent, lesions may leave behind pox-like scars or pigment changes.[1]

uncommon

immunosuppression

Patients infected with HIV.[24]

recent illness

Recent upper respiratory tract or other infection.[3]

family history of pityriasis lichenoides

Rare cases of presenting in families have been reported.[1]

headache

Constitutional symptoms may precede the rash.[1][3]

myalgias/arthralgias

Constitutional symptoms may precede the rash.[1][3]

malaise

Constitutional symptoms may precede the rash.[1][3]

burning/pruritus

Constitutional symptoms may precede the rash.[1][3]

multiorgan failure

In severe ulceronecrotic form patients may have fever and other signs of internal organ involvement.[23]

Risk factors

weak

childhood to early adult age

Tends to present in late childhood and early adulthood.[1]

male sex

There is a slight predisposition in men.[1]

HIV

Patients with HIV have slight predisposition for developing the condition.[1]

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