ABSTRACT
Pityriasis lichenoides (PL) represents a unique group of uncommon acquired inflammatory skin disorders that include two main variants, pityriasis lichenoides et varioliformis acuta (PLEVA) and pityriasis lichenoides chronica (PLC), and a third much rarer and aggressive form known as febrile ulceronecrotic Mucha-Habermann disease, 1–2 which is not addressed in this chapter.
