👉 The term "what causes black hair to turn red" refers to a medical condition known as blepharitis, which occurs when there is an irritation or inflammation in the eyelid area due to bacterial infections. During this condition, bacteria can enter the skin and cause an inflammatory reaction that leads to an increase in production of collagen in the skin. This process can result in the formation of new skin cells, including hair follicles, which can become red or purple as a result. The color of these red spots can also vary depending on the severity of the blepharitis. In severe cases of blepharitis, there may be a complete loss of hair due to the inflammation and destruction of the follicle-producing cells that normally produce hair. This condition is often characterized by sudden onset of black, red, or purple skin reactions with associated itching and discomfort for short periods of time followed by full recovery. It's worth noting that blepharitis can be caused by a variety of factors such as bacterial infections, allergies, eczema, and stress, among others. If you have any concerns about your eyes or the appearance of your eyelid area, it may be best to consult with a medical professional for further evaluation and treatment options.