Photosensitive dermatitis
Photosensitive dermatitis sometimes referred to as sun poisoning or photoallergy, is a form of allergic contact dermatitis. It is distinct from sunburn. Photosensitivity dermatitis may be suspected if an itchy rash on the limbs suddenly occurs during vacation.

Photosensitive dermatitis may result in swelling, difficulty breathing, a burning sensation, a red itchy rash sometimes resembling small blisters, and peeling of the skin. There may also be blotches where the itching may persist for long periods of time.

  • '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 
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.