Seborrheic dermatitis is a common skin condition that causes flaky,dry, white to yellowish scales to form on oily areas esp under the
nose or anywhere on face. You can treat flaking and dryness with over-the-counter
dandruff or medicated creams which contain salicylic acid, coal tar, zinc, resorcin, ketoconazole, or selenium.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided.