What is seborrheic dermatitis?

• Seborrheic dermatitis (SD) or dandruff, is a common skin condition that mainly affects the scalp. It causes scaly patches, red skin and stubborn dandruff • It can also affect oily areas of the body: face, sides of the nose, eyebrows, ears, eyelids and chest • SD may go away without treatment. It may need many repeated treatments before the symptoms decrease. And they may recur