The precise cause of seborrheic dermatitis isn't known, but it's believed to be caused by some combination of genetics, an abnormal immune response to skin yeast, and excess oil production.
Symptoms include pink, purple, or lighter-colored scaly, itchy patches on the face, ears, chest, scalp, or other oily areas. Seborrheic dermatitis on the scalp may also lead to dandruff.
No, while seborrheic dermatitis is uncomfortable, it is not dangerous.
No, seborrheic dermatitis is not contagious.
There is not a cure for seborrheic dermatitis, but there are a variety of effective treatment options that can greatly reduce or eliminate symptoms.
In some cases, seborrheic dermatitis may lead to infection if you scratch and break open your skin. Consulting with a dermatologist who can come up with an appropriate treatment plan can lessen symptoms and the risk of infection.