You do not kiss your way to an infection overnight.Fits in with an aphthous stomatitis.Bcomplex should help.
Hello,
From the picture it looks like a canker sore. Avoid spicy or acidic foods during this time.You can use topical ointments like numbing ointments, such as benzocaine (Oragel), anti-inflammatory (steroid) gels,benadryl allergy liquid mouthwash,oral preparations of steroids and vitamin supplements.
But if the sores last for more than 3 wks or start spreading then pls consult a dermatologist. In that case herpes simplex I has to be ruled out.
Hope it helps.Take care and pls do keep me posted on how you are doing or if you have any additional queries.Kind regards.