It is all alopecia areata: It is time to abandon the terms alopecia totalis and alopecia universalis

To the Editor: There is confusion regarding the classification of alopecia areata (AA). In the article “Development of the alopecia areata scale for clinical use: results of an academic-industry collaborative effort,”1 it is evident that even experts in AA disagree on the definitions of alopecia totalis (AT) and alopecia universalis (AU). When asked to define AT, 21 alopecia experts gave answers ranging from “≥80% loss of hair on the scalp (with or without facial hair loss)” to “100% scalp hair loss” (Table I).