Dermatologists from Perth suspect anaerobic bacteria may be responsible for four cases of hyperkeratotic erythema in the groin, which all responded “dramatically” to amoxicillin-clavulanic acid.

Writing in the Australasian Journal of Dermatology, they describe the cases of three women and a man who presented with inguinal rashes that did not respond to topical steroids, antifungals or flucloxacillin.