Abstract: Fifty patients with photodermatitis were analysed.Definite causes were found only in 6 Cases,while no definite cause in the remains.In 25 cases with no definite cause the disease attacked seasonally in spring and summer,but 7 of them were attacking unseasonally later.phototest was performed on 44 cases,all of them were sensitive to UVA,and half of Chem sensitive to UVB also.

Key words: Photodcrmatitis, Phototest