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(A) Cross-section of mandibular incisor hair-induced periodontitis with ipsilateral ulcerative dermatitis (asterisk). Magnification, ×4. (B) Higher magnification of the boxed region of panel A shows expansion of the periodontal space with inflammation, fibrosis, and hair fragments (arrows). Also note the scalloping of mandibular bone due to resorption and reformation (arrowheads). Magnification, ×10.
