A chronic inflammatory skin disease.
An eruption of small itchy blisters, e.g. those caused by sunlight.
Eruption of small, usually very itchy, blisters on skin exposed to sunlight, occurring most often in children.
An eruption of small blisters accompanied by intense itching, occurring (usually in preadolescent boys) on skin surfaces exposed to sunlight. Hydroa is a severe form of light-sensitive dermatitis, described as polymorphic light eruptions.
A broad term describing any skin condition marked by the development of small blisters.