Immune cells are specialized cells within the immune system that play a crucial role in defending the body against pathogens and foreign substances. In the context of hair loss, certain immune cells, such as T cells, can mistakenly target hair follicles, leading to conditions like alopecia areata, where hair is lost in patches due to an autoimmune response. Key distinguishing characteristics of immune cells include their ability to recognize and respond to antigens, as well as their diverse types, including lymphocytes, macrophages, and dendritic cells, each with specific functions in immune regulation and response. Understanding the role of immune cells in hair biology is essential for developing targeted therapies for autoimmune-related hair loss conditions.