A case of a clinical syndrome of selective hereditary complete IgA deficiency with partial T-lymphocyte inactivation is reported. A 14 year old boy was admitted with chjef complaint of persistent wide shallow ulcerated non-vesicular patches on the skin folds of whole body, chronic upper respiatory infections and gastointestinal upsets. General appearance showed us as if the undemourished or malabsorption status had been accompanied. The duration of illness was about 10 years under the incorrect or mistaken diagnosis and skin lesions have incompletely responded to the treatment. Peripheral T-lymphocyte determination was carried out by the method of Wybran to be tumed out active T-cell 14%, total T-cell 48%. Tuberculin test showed negative with 5 TU. Immunoglobulin values were respectively as follows: IgG 325 mg%, IgM 60 mg%, and IgA trace. And we diagnosed this case as selective IgA defiency with partial T-lymphocyte inactivation. We started the immunochemotherapy with tuberculo-protein complex, Tubercin-3 and antibictics for 2 months. After 2 months with above regimen. the skin lesions were markedly improved. T-cell count also retumed to the normal limit(active 35%, total 59%) and levels of TgG and IgM raised(IgG 617.5 mg%, IgM 75mg%), but IgA still showed trace amount, Tuberculin test tumed out positive.