Autoimmune disease does run in my family but the three generations that I verify, didn’t get it till later age (20s 33 for myself, all of us developed during periods of high stress). My 9 year old is developing it now and I believe chronic physical stress of mask-wearing is a factor. As with most autoimmune disease causative factor is very hard to prove. However Genetic disposition to autoimmune disease is brought out by physical stress.