There is a rare condition described in a few case reports called autoimmune progesterone dermatitis. Basically this is a condition in which a patient develops antibodies to progesterone, one of the sex hormones that peaks in the body right before menstruation. The patients who have this condition tend to have an itchy, cyclical rash that typically begins a little bit before the menstrual period begins and ends a few days in. Most cases of the rash are quite mild, and they can be managed by simple application of a topical steroid cream and oral antihistamines to control the itch.
You should see you doctor
, however, before beginning therapy to confirm that this is the likely condition. Another possibility would be that you simply have eczema
, which is a condition characterized by excessive dryness, redness, and itching of the skin. This may be worse with menstruation simply because your body is more sensitive at this time. Fortunately, the therapy for eczema is the same as for autoimmune progesterone dermatitis (topical steroid creams), so the exact diagnosis might not matter too much.
If the symptoms worsen or if you have any wheezing or other respiratory allergy symptoms you should definitely see your doctor.