PMC10162733_01
Oral findings at the first visit. Minor aphtha was found on the soft palate and mandibular gingiva, and erosion was found on the hard palate (arrow)
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F1
Minor aphthae were observed in the soft palate and mandibular gingiva; the hard palate had slightly eroded [Figure 1].
Oral findings at the time of the oral challenge test (a) No obvious redness observed on the palatal mucosa before the oral challenge test (b) After ingestion of mustard, mild redness observed on the mucosa of the hard palate (arrow) (c) After ingestion of wasabi, a wide range of mucosal redness observed from the hard palate to the soft palate (arrowhead)
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F2
An oral challenge test was performed using mustard and wasabi; the patient experienced a tingling sensation in the palate immediately after ingestion, and the mucous membrane appeared red [Figure 2].