Describes the partial or complete loss of hair most commonly on scalp?

The partial or complete loss of hair most commonly on the scalp is called alopecia. Alopecia can be caused by a variety of factors, including genetics, hormonal imbalances, medical conditions, and medications. Some common types of alopecia include:

- Androgenetic alopecia: This is the most common type of hair loss, affecting both men and women. It is caused by a combination of genetic and hormonal factors. In men, it is commonly known as male pattern baldness, while in women, it is called female pattern hair loss.

- Alopecia areata: This is an autoimmune condition in which the immune system attacks the hair follicles, leading to hair loss. It can cause round or oval patches of hair loss on the scalp or other parts of the body.

- Telogen effluvium: This is a temporary form of hair loss that occurs when a large number of hair follicles enter the resting (telogen) phase of the hair growth cycle at the same time. It can be caused by various factors, such as stress, illness, childbirth, or certain medications.

- Traction alopecia: This type of hair loss is caused by excessive tension or pulling on the hair. It can occur due to hairstyles that put stress on the hair, such as tight braids or ponytails, or from hair extensions or weaves.

- Scarring alopecia: This type of hair loss occurs when the hair follicles are destroyed and replaced by scar tissue. It can be caused by infections, burns, or other forms of trauma to the scalp.