What is the cause of anonychia?

Anonychia is a condition characterized by the absence of nails on one or more fingers or toes. It can be caused by genetic factors, such as mutations in specific genes associated with nail development, or by environmental factors, including trauma or infections during early childhood. In some cases, anonychia may be associated with syndromes like ectodermal dysplasia. Additionally, certain medical conditions or treatments may also lead to nail loss, but these are less common.