The National Institutes of Health (NIH) reports that it is not known exactly why seborrheic dermatitis occurs. That said, there may be a number of reasons why a person would develop this condition. These include combination hormone levels, a weakened immune system, nutrient deficiencies, and issues with the nervous system. In addition, malassezia can be a cause of seborrheic dermatitis.
It is also important to know that there are risk factors that can lead to this condition. For starters, it can be hereditary. So if it runs in your family, your risk may increase. Further, exhaustion or stress, harsh weather, improper hygiene, lotions that contain alcohol, oily skin, being overweight, and certain immune and neurological conditions may elevate your risk of developing seborrheic dermatitis.
The good news is that this issue can often be treated with products that can be purchased at drugstores. The NIH suggests identifying products that specifically treat seborrheic dermatitis (as opposed to simple dandruff shampoos). These products may include the following ingredients: salicylic acid, coal tar, zinc, resorcin, ketoconazole, and/or selenium sulfide.
If these products aren't effective, see a dermatologist or trusted doctor. You may need prescription formulas developed for severe cases of seborrheic dermatitis. And be aware that this condition may come back. It is thought to be a chronic condition in that it can recur at any time.
4. Psoriasis
Psoriasis is a skin condition that can appear on the scalp. Though psoriasis is not dandruff, it can be confused with dandruff because it causes the skin to peel in white or silver flakes. In addition to flakes, psoriasis may also cause bleeding, red patches, soreness, and temporary hair loss.