Thinning and greasy hair may be caused by seborrheic alopecia, which is often accompanied by different patterns of hair loss forms. Seborrheic alopecia, also known as androgenic alopecia, is a common hair loss disease that occurs during and after puberty. On the basis of hair loss and thinning of hair, it is often accompanied by local symptoms such as increased oil secretion from the scalp, greasy hair, increased dandruff, itching, etc. Therefore, thinning of greasy hair may be caused by seborrheic alopecia. It is worth noting that seborrheic alopecia often manifests itself in different forms of hair loss, for example, male pattern alopecia often manifests itself in the early stage as thinning and sparse hair on both sides of the forehead, and then the hair loss slowly extends to the top of the head, the frontal hairline recedes backward, and the hair on top of the head gradually begins to fall out, and eventually the forehead becomes high to form a “high forehead”, and the hair is in the form of an M shape, and even forms the characteristic “horse” shape, which is serious. Even the characteristic “horseshoe” pattern is formed; female pattern baldness is often manifested as the gradual thinning of hair on the top of the head, the frontal hairline loss is not obvious, and the frontal hairline is shifted back and complete baldness is rare in women. In terms of treatment, patients with androgenetic alopecia can be treated with drugs that inhibit the secretion of androgens (e.g. finasteride, cyproterone, etc.) orally under the guidance of a physician, and at the same time, Minoxidil can be used externally to promote hair growth.