Redness and tenderness in the floor of the mouth may be a symptom of mononucleosis, gingivitis, measles, scarlet fever, scabies, leukemia, pemphigus, tinea versicolor, raynaud's disease, kawasaki syndrome, psoriasis, shingles, erythema, lupus, candidiasis of skin or syphilis. To learn more about the cause of your symptoms, click on each of the diseases listed below.
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