From the symptoms it sounds like seborrheic dermatitis. 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 shampoos. Shampoo the hair vigorously and frequently (preferably daily). Active ingredients in these shampoos include salicylic acid, coal tar, zinc, resorcin, ketoconazole, or selenium.
If the symptoms persist, then it would be best to get it confirmed from a dermatologist
Hope it helps. Take care and do keep me posted on how you are doing or if you have any additional queries. Warm regards.
Thanks. A dermatologist said I have seborrheic dermatitis on my scalp. I've tried coal tar shampoo and ketoconazole, and neither works too well. I still have the scabs on my scalp and face, though maybe reduced in frequency.
This didn't occur on my face in the past. Why would it appear over time? Can I make it go away permanently?