Exposure to sunlight can precipitate :

B i.e. Discoid lupus erytyhematosus - Photosensitive dermatitis (skin lesions) are lupus erythematosus (SLE, DLE, SCLE), porphyriasQ (erythropoietic/hepatoerythropoietic/ variegate porphyria, erythropoietic protoporphyria and porphyria cutaneatardaQ), psoriasis, pellagra, pemphigus, lichen planus (actinicus), and liver spots (lentigo senelis)Q. Morphea is localized form of scleroderma (systemic sclerosis). Calcinosis cutis is calcified lesions seen in scleroderma & dermatomyositis.