Or the cause might be a fungus, called Pityrosporum ovale. This organism is normally present in the skin in small numbers, but sometimes its numbers increase, resulting in the skin disease. Seborrheic dermatitis has also been linked to neurologic disorders such as Parkinson's disease and epilepsy. The reason for this relationship isn't known. The treatment of seborrheic dermatitis depends on its location on the body.
Treatment also depends on the person's age.
These shampoos can be used 2 times a week. If you have dandruff, you might start by using one of these shampoos daily until your dandruff is controlled, and then use it 2 or 3 times a week. When you use a dandruff shampoo, rub the shampoo into your hair thoroughly and let it stay on your hair and scalp for at least 5 minutes before rinsing. This will give it time to work. Seborrheic dermatitis of the folds of the skin in adolescents and adults.