alopecia areata alopecia areata alopecia areata PubMed Health Alopecia Areata alopecia areata Alopecia Areata Alopecia Areata Alopecia Areata Alopecia Areata back alopecia areata back hair loss in round patches alopecia areata http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002421/ Alopecia Areata hair loss in round patches