Photosensitive dermatitishttps://en.wikipedia.org/wiki/Photodermatitis
Photosensitive dermatitis, sometimes referred to as sun poisoning or photoallergy, is a form of allergic contact dermatitis. It is distinct from sunburn. Photosensitive dermatitis may be suspected if an itchy rash suddenly appears on the limbs during a vacation.

Photosensitive dermatitis may cause swelling, difficulty breathing, a burning sensation, a red itchy rash that sometimes resembles small blisters, and skin peeling. Blotches may also appear, and the itching can persist for long periods of time.

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  • 'Postinflammatory hyperpigmentation' after Photosensitive dermatitis; Photodermatitis is more common on the back of the hand than on the fingers.
  • An acute photosensitivity reaction in EPP (Erythropoietic protoporphyria); Sun-induced dermatitis usually occurs on the dorsal side of the hands and the exposed areas of the arms. Unlike contact dermatitis, a symmetrical location and tiny palpable lesions are characteristic.
  • Hydroa vacciniforme
References Photosensitivity 28613726 
NIH
Photosensitivity refers to various symptoms, diseases, and conditions (photodermatoses) caused or exacerbated by exposure to sunlight. It is classified into five categories: primary photodermatosis, exogenous photodermatosis, photo-exacerbated dermatoses, metabolic photodermatosis, and genetic photodermatosis.