Hello doc. When I rub my fingers behind my ear it smells. I wash behind my ears twice a day. Pls doc, is there a medical reason for this?

Sebum & Bacterial. Byproducts. Propionic acid, for one, can be produced by a variety of bacteria - propionibacterium species thrive in areas of the skin that have more sebaceous glands. Sebum itself can also be malodorous. Talking with a dermatologist might provide you with some solutions.