This determines a particular predisposition to react to solar radiation, with the consequent appearance of dermatosis skin lesions. This may be due to toxins or allergies or of unknown cause, such as a polymorphic light eruptions (markedly pruriginous erythemato-papulo-vesicular lesions in sun-exposed areas producing outbreaks, most often in the spring and summertime), solar urticaria (hives, during or immediately following sun exposure) or actinic dermatitis (a persistent rash of generally eczematous nature in sun-exposed areas, more intense during sunny periods)
