Diagnosis is a shoe-in

IN A patient presenting with a scaling, oozing rash like this on the dorsa of the feet, shoe contact dermatitis should always be considered.

The allergen is either potassium dichromate, used to tan the leather, or various types of glues used to hold the layers of the shoe together.

As a shoe wears, the glue in the lining is released when the feet sweat, and then an allergy can develop. So be mindful of old shoes or cheaper tennis shoes that have worn through inside.

Allergy to the rubber soles is less common and paradoxically may not show on the