[Bazin's hydroa vacciniforme : photobiological and metabolic study in 3 cases, and discussion on etiopathogenicity (author's transl)].

The authors described three cases of Bazin's hydroa vacciniforme. Study of the history of the disease enables present nosological conceptions to be better understood. Diagnosis of hydroa vacciniforme is essentially clinical : appearance of the rash, periodicity and spontaneous improvement after puberty are characteristic. Hydroa vacciniforme has to be distinguished from porphyrias and polymorphous light sensitive eruptions. The etiology of this photodermatosis of child is unknown, but associated disturbances in tryptophan metabolism in some cases seem to be linked to a vitamin B6 deficiency.