pityriasis lichenoides et varioliformis acuta

noun

pityriasis li·​che·​noi·​des et var·​i·​o·​li·​for·​mis acu·​ta -ˌlī-kə-ˈnȯi-ˌdēz-et-ˌvar-ē-ˌō-lə-ˈfȯr-məs-ə-ˈk(y)üt-ə 

: 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