<unk>  is a general term used to describe itchy eruptions of the skin.
Specific types include:<unk>  nodularis
Actinic<unk> 
Besnier's<unk>  (a specific type of atopic dermatitis).
Prurigo
Erythroderma
Swimmer's itch
Pellagra
Ulerythema
Leukonychia
Jock itch
Koilonychia