[Phototoxic and photoallergic reactions of the skin (author's transl)].

Phototoxic and photoallergic reactions of the skin are certainly not very common, but, on the other hand, the complete list of medicinal substances which are accused of causing them is extremely extensive. For this reason, dispensing with many details, an attempt is made to present the basis of such reactions. After irradiation with longwave ultra-violet light, which alone would not have produced inflammation, a reaction occurred through the agency of many drugs which can proceed according to a toxic or allergic mechanism.