A smooth, round bald patch can sometimes appear almost out of nowhere! One possible cause is alopecia areata, an autoimmune condition where the immune system mistakenly attacks the hair follicle. It can cause small round patches, but in more severe cases it can affect larger areas of the scalp or body. The unpredictable part is that hair can regrow and then shed again later. Treatment may include steroid injections and, for more severe cases, medications like JAK inhibitors. If you notice a sudden bald patch, it’s worth getting it evaluated instead of waiting it out. #AlopeciaAreata #HairLoss #AutoimmuneHairLoss #HairThinning #HealthyHair - @rootmd