Progesterone is one of the female hormones and some women develop autoimmune progesterone dermatitis, with symptoms ranging from allergic rashes to full anaphylactic shock. Treatments include steroids, antihistamines, progesterone-blocking drugs or removal of the ovaries.

See the paper in the International Journal of Dermatology. From Discover’s 20 Things You Didn’t Know About… Allergies.

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