The cell mediated immunity is studied in 1,500 patients with a superficial fungal infections or a cutaneous vitral infection (warts, condylomata and recurrent herpes simplex). None of the patients have another cutaneous or systemic disease. Delayed cutaneous or systemic disease. Delayed cutaneous hypersensitivity test for primary cellular immune response (DNCB) and secondary response (PPD), are significantly decreased in these skin disorders. The peripheral lymphocytes and the T lymphocytes of the blood of patients with warts and recurrent herpes, are also decreased. These skin diseases may be clinical signs of a partial and/or a transitory cell mediated immune deficiency.