Certain hair care products can irritate the scalp and may cause dandruff. If a person finds that a product is causing irritation, they should try switching to a gentle, non-medicated shampoo. Some people say not shampooing enough can cause a buildup of oil and dead skin cells, leading to dandruff.

What is dandruff caused by?

Often, a fungus called malassezia triggers dandruff. This fungus normally lives on your scalp. Yet some people have too much of it, and it causes skin cells to multiply more quickly than usual.

Why do I have dandruff even if I shampoo?

Symptoms and causes

irritated and oily skin, a condition also known as seborrheic dermatitis (a more severe form of dandruff) not shampooing enough, which causes skin cells to accumulate and create flakes and itching. yeast called malassezia, which aggravate your scalp and cause excess skin cell growth.