Autoimmune progesterone dermatitis: Case report of an unexpected treatment reaction.

Autoimmune progesterone dermatitis (APD) is a rare skin condition with a varying morphology, which appears on a monthly basis during the luteal phase of the menstrual cycle and resolves spontaneously with the endogenous decrease in progesterone during menses. We present the case of 39-year-old multiparous Caucasian woman with generalised, self-limited urticaria in her perimenstrual period. APD was diagnosed in light of the cyclical nature of the symptoms. An intradermal test with the administration of 0.5 mg/mL of medroxyprogesterone acetate showed a positive result. She started using vaginal hormonal contraceptive that paradoxically exacerbate the symptoms, which ceased after the removal of the device. An oral combined contraceptive was initiated instead, with complete resolution of the symptoms. We share the case because of the rarity of the situation, emphasising the importance of a multidisciplinary team for differential diagnosis and patient follow up.