<unk>  is a rare sunlight-induced, pruritic, papular or nodular skin eruption. Some medical experts use the term<unk>  to denote a rare photodermatosis that develops in childhood and is chronic and persistent; this rare photodermatosis, associated with the human leukocyte antigen HLA-DR4, is often called "Familial polymorphous light eruption of American Indians" or "Hereditary polymorphous light eruption of American Indians" but some experts consider it to be a variant of the syndrome known as polymorphous light eruption (PMLE). Some experts use the term<unk>  for Hutchinson's summer<unk>  (aka hydroa aestivale) and several other photodermatoses that might, or might not, be distinct clinical entities.
Actinic prurigo
Eczema vaccinatum
Alopecia mucinosa
Molluscum dermatitis
Livedoid dermatitis
Lichen nitidus
Abietic acid dermatitis
Ichthyosis acquisita