Patchy baldness can spread. Patchy baldness refers to sudden, limited patchy hair loss, often associated with autoimmune, genetic, emotional stress and endocrine factors, etc. Generally, the hair loss area of patchy baldness is free of inflammation and scarring, and in the early stage, the hair can regenerate. In the progressive stage, there will be loose hair at the edge, the hair loss area will be enlarged, and in serious cases, total baldness or generalized baldness may even occur, and hair loss will occur all over the body. Patchy baldness through active treatment can promote hair regeneration. Generally, local or systematic medication is used, and physical therapy such as photoelectricity is also available. In daily life, try to maintain a regular routine, combine work and rest, get enough sleep, and be in a good mood. Hair loss should be consulted in time to avoid delaying the condition.