PMC10411268_01
Facial and oral views of the patient: (A) physiological pigmentation was present on her face and (B-D) oral mucosal pigmentation was found on her lips, buccal mucosa and gingiva.
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Pigmentation, which seemed to be a physiological change, was also observed on her facial skin (Figure 1).
Longitudinal streaks were seen on the patient's left big toe nail.
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At the next dental examination, the patient's fingers and toes were observed as not being pigmented, although longitudinal streaks were observed on her left first toenail (Figure 2).