There are two types of dermatitis of the ear canal:
Contact dermatitis of the ear canal is an allergic reaction to triggers such as nickel-containing earrings and numerous beauty products (for example, hairsprays, lotions, and hair dye).
Aural eczematoid dermatitis of the ear canal can occur spontaneously in some people who have certain kinds of dermatitis-like conditions such as seborrheic dermatitis Seborrheic Dermatitis Seborrheic dermatitis is chronic inflammation that causes yellow, greasy scales and dandruff to form on areas of the skin that have a high number of oil glands such as the scalp and face, along... read more and psoriasis Psoriasis Psoriasis is a chronic, recurring disease that causes one or more raised, red patches that have silvery scales and a distinct border between the patch and normal skin. A problem with the immune... read more .
The skin irritation and cracking caused by dermatitis may allow a bacterial or fungal ear canal infection Ear Canal Infection (Swimmer's Ear) Bacteria and sometimes fungi can cause acute infection of the skin of the ear canal. Ear canal infection is caused by bacteria or, less commonly, fungi. Typical symptoms are pain and discharge... read more (acute external otitis) to develop.
To treat contact dermatitis, people should eliminate allergic triggers, especially earrings containing nickel, hairsprays, and possibly even hearing aid molds. Trial and error may be needed to identify the allergic trigger. Doctors give people a cream containing a corticosteroid such as hydrocortisone or betamethasone to decrease swelling and itching. People should avoid putting cotton swabs, water, and other possibly irritating substances in the ear. For more severely inflamed ears, corticosteroids taken by mouth (such as prednisone) may be prescribed.
To treat aural eczematoid dermatitis, doctors give people drops of a diluted aluminum acetate solution (Burow solution) to put in the ear as often as is required for comfort. Itching and swelling can be reduced with a cream containing a corticosteroid (such as betamethasone). Again, avoidance of all irritants to the ear canal, such as cotton swabs and water, is an important part of the treatment of this condition.