The barrier abnormality, a loss-of-function mutation in the gene encoding filaggrin (FLG), which is linked to the incidence of atopic dermatitis (AD), is a recently discovered but important factor in the pathogenesis of AD. Flaky tail (Flg ft ) mice, essentially deficient in filaggrin, have been used to investigate the role of filaggrin on AD. However, the relevancy of