pityriasis lichenoides et varioliformis acuta
nounMedical Definition of pityriasis lichenoides et varioliformis acuta
: a disease of unknown cause that is characterized by the sudden appearance of polymorphous lesions (as papules, purpuric vesicles, crusts, or ulcerations) resembling chicken pox but tending to persist from a month to as long as years, occurs especially between the ages of 30 and 50, and is more common in men