What are the Causes of patchy hair loss (Alopecia Areata)?
1. Autoimmune theory: Alopecia areata is thought to be an autoimmune disease where the body produces antibodies (‘auto’antibodies) against the hair germinal cells and cause their destruction in localized areas. The localization of lesions also point towards a neural pathway involvement. In patients with graying hairs, it is common to see that only the black hairs fall off in the patches. Sparing of the grey hairs in alopecia areata indicates that normal nerve supply and melanin pigment is necessary for the alopecia areata to occur. 2. Direct pressure: Many patients get patchy hair loss(alopecia areata) following direct pressure on hair bearing areas, e.g., from a tight fitting helmet, pressing the head against bed rails for prolonged duration while watching TV etc. 3. Mobile phones and patchy hair loss(alopecia areata): Another complication of the modern device! Before the hands free sets became common, a number of patients, especially those using cheaper brands of cell phones, present
