Pityriasis Lichenoides

**Definition:** A subgroup of PARAPSORIASIS itself divided into acute and chronic forms. The acute form is characterized by the abrupt onset of a generalized, reddish-brown, maculopapular eruption. Lesions may be vesicular, hemorrhagic, crusted, or necrotic. Histologically the disease is characterized by epidermal necrolysis. The chronic form shows milder skin changes with necrosis.

**Tree numbers:** - C17.800.859.475.650 - C17.800.859.575.650 - C17.800.859.600.650