al. 1 are to be congratulated on their recent publication. This excellent addition to the literature reports a retrospective case series of 60 oral erythema multiforme (EM) patients. However, presently, diagnostic criteria that distinguish between EM major (EMM), EM minor (EMm), Stevens-Johnson syndrome (SJS), and toxic epidermal necrolysis (TEN) are available. Celentano et al. 1 have combined all of these diagnostic entities within the category of EM. This grouping is certainly appropriate, since the study patient population was initiated in 1982, when all such diagnoses would have been described within the category of EM. The authors commented that diagnostic criteria between EMM, EMm, SJS, and TEN presently are not universally accepted. However, a case can be made that such diagnostic criteria are presently relatively well established, although not universally accepted. 1-7 In 2005, Williams and Conklin 2 summarized the dermatologic diagnostic standards for EM, SJS, and TEN, as reported by Bastuji-Garin et al., 3 Assier et al., 4 and Auquier-Dunant et al., 5 and Cote et al. 6 These standards describe EM, SJS, and TEN as separate diagnostic entities with relatively well-defined diagnostic characteristics. Furthermore, Ayangco and Rogers 7 defined the similarities and differences between EMm and EMM. Hopefully in the near future, the oral medicine and oral and maxillofacial pathology communities will undertake confirmation of universally accepted diagnostic standards for EMM, EMm, SJS, and TEN, possibly at the next World Workshop of Oral Medicine.