“… 25 Oestrogen dermatitis, a recently characterized entity which also presents as significant premenstrual flares of skin lesions, 26 was in the past misdiagnosed as autoimmune progesterone dermatitis 27 . Nowadays, the diagnosis of autoimmune progesterone dermatitis requires a recurrent eruption related to the menses and the demonstration of progesterone sensitization by means of skin tests with intradermal injection of progesterone, 1 , 3 , 6 , 7 , 10 , 15 , 16 , 28 , 29 the oral 11 , 12 , 14 or intramuscular administration of progesterone 1 , 6 , 13 , 14 , 19 as challenge tests, basophil degranulation tests 2 , 12 or the detection of circulating serum antibodies to progesterone (antibodies to the luteinizing cells of the corpus luteum) 1 ,. 2 , 7 , 9 …”