Large pieces of dandruff on the top of the head may be caused by physiological factors, may also be caused by pathological factors, such as psoriasis, seborrheic dermatitis.
1. Physiological factors: In general, dandruff is the result of metabolism, keratinocytes are constantly renewed iteratively, and the cells that die after aging are shed from the scalp.
2. Pathologic factors:
(1) Psoriasis: there may be an immune-inflammatory response under the combined effect of genetic and environmental factors. There will be a large accumulation of poorly keratinized cells on the epidermis, and the characteristic scaly appearance of psoriasis will develop, which will result in large patches of dandruff on the top of the head.
(2) Seborrheic dermatitis: mainly due to the growth of Malassezia bacteria, sebaceous glands secrete sebum exuberantly, as well as the barrier function of the skin is impaired, and so on, and cause skin inflammation, so that the metabolism is accelerated, which will lead to a lot of keratotic epidermal cells fall off, forming a large number of dandruff, and the top of the head will be the emergence of large pieces of dandruff.
If the patient has a large piece of dandruff on the top of the head, it is recommended to go to the hospital in time, and actively cooperate with the doctor for treatment.