These are likely to be canker sores, also called as aphthous stomatitis / ulcers. Recurrent aphthous stomatitis is not an uncommon condition. The cause is usually not determinable and following are the predisposing factors;
1) Deficiency of iron, folic acid (folate), or vitamin B.
3) Food allergies
4) Sodium lauryl sulphate found in oral healthcare products (mouth washes) may aggravate or produce oral ulceration.
5) Certain medications
6) Helicobacter pylori which causes stomach ulcer may be associated.
7) Decreased body resistance (immunity).
Treatment of it is following;
The treatment consists of a multi point approach, consisting of the following:
1. Tetracyclin in the form of mouth swish or expectorate. This is effective for its antibacterial action.
2. Topical anesthetic in the form of a Benzocaine paste. This helps to numb the pain temporarily.
3. A topical steroid gel containing Triamcinolone Acetonide. This helps to reduce the inflammation.
4. A 2-3 weeks course of vitamin B complex capsules. This helps to correct any nutritional deficiencies.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.