An out-of-body experience. That’s how Cody Purvis describes losing nearly 75% of the hair on her head as a result of the autoimmune disease alopecia areata. “The person that I looked at in the mirror every day was just not who I was,” says Purvis, a pet boarding and grooming business owner in Kanawha, Iowa. In alopecia areata, the body’s immune system attacks hair follicles. It can result in…