Circulating testosterone, sex hormone binding globulin and prolactin in women with late onset or persistent acne vulgaris.

Serum testosterone, sex hormone binding globulin (SHBG) and prolactin were measured in thirty-eight women with acne which persisted or started after the age of 18 years. One or more of these levels were abnormal in 76% of patients. Increased testosterone or low SHBG were present alone or in combination in 60% of patients. This group was presumed to have a raised level of non-protein bound, metabolically-available testosterone. Hyperprolactinaemia, which was present in 45% of patients, may be important in view of the reported association with increased adrenal androgens. The hormonal abnormalities may be causally related to the acne and a greater understanding of them may lead to better treatment.