Thanks for using health Care magic. Read your query. The signs can symptoms suggests a canker sore(apthous ulcers) which is usually due to increased stress level, anemia ,Vitamin B deficiency and food related . I would advice you to apply mucopain/dentogel on the lesions two or three times daily till it heals .healing time will be around a week. Avoid stress and have a nutritious diet .Multi-vitamin supplement can be taken.If still persistent,consult an oral surgeon. Use an antiseptic mouth wash for a while and avoid spicy food. Hope this was helpful. Thanks and regards.