Scales on the scalp are often misinterpreted as a part of a dry skin problem. Although some scalp conditions, such as psoriasis, are marked by dry scales, oily scales on the scalp are related to other types of problems. Oily scales can be treated by preventing the accumulation of oil on the scalp. However, you may need to see a doctor for further treatment depending upon the type of scalp condition and its severity.
Sebborheic Dermatitis
Sebborheic dermatitis is a skin condition that can affect your scalp, as well as other areas of your body that have a high number of oil glands, such as the nose. According to Medline Plus, sebborheic dermatitis is the most common cause of scales on the scalp, and is prevalent in infants as well. Infantile sebborheic dermatitis is referred to as cradle cap.
Sebborheic dermatitis is caused when an excessive amount of oil is produced from your scalp. The resulting scales are white or yellow. The areas surrounding the scales are often red and irritated. You may be more prone to developing sebborheic dermatitis if you have oily skin and if you do not wash your hair regularly. Sebborheic dermatitis is treated with over-the-counter medicated shampoos such as Selsun Blue. Gently brush the scales out after shampooing. A prescription shampoo may be required if the scales do not go away.
Malassezia
The Mayo Clinic defines malassezia as a fungus that resembles yeast. Malassezia is normally present on people’s scalps in moderate amounts. In some cases, however, malassezia can grow in increased amounts due to hormonal changes, decreased immunity, neurological diseases, stress, lack of shampooing and a malassezia sensitivity.
When malassezia multiplies, it feeds on the oils present on your scalp. The scalp then responds by producing more oil and skin cells to make up for the lack of oil. The mix of oil and skin cells results in dandruff-like patches on the scalp. Once malassezia is diagnosed by your doctor, he may recommend a prescription anti-fungal shampoo.
Poor Hygiene
Patients with dry scalp or dandruff often skip shampoo sessions without first consulting with a doctor. While this may be a solution for extremely dry scalp or scalp psoriasis, dandruff can actually be caused by not washing your hair often enough. Washing your scalp and hair helps remove natural oil accumulation as well as dead skin cells. The Mayo Clinic explains that when you skip shampooing, the dead skin cells and oil build up on your scalp, resulting in oily dandruff.
If you have recurring oily dandruff problems, start washing your hair once a day. Follow with a light-weight conditioner that will help replenish moisture into your hair without leading to oily build-up on your scalp. Consider using an anti-dandruff shampoo twice a week such as Head and Shoulders or Selsun Blue.


