[A case of autoimmune progesterone dermatitis]

A 41-year-old Japanese woman came to our clinic complaining of multiple edematous erythemas on the trunk and legs. The eruptions recurred periodically in association with the menstrual cycle. She had received oral progesterone therapy between 24 and 34 years of age. There were no abnormal values found in the routine and hormonal examinations, including progesterone and estrogen levels in serum and urine. After an intradermal skin test with progesterone, she had no reaction after 20 minutes but a positive reaction after 48 hours.