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You are having mouth ulcers probably due to vitamin deficiency
, sharp tooth, biting of the lips. You can take B complex capsules once a day for a week, it may reduce. Use dental anaesthetic gel on them for pain relief. Show to a Dentist
to rule out sharp tooth which can be treated. If you are getting frequent ulcers you may need to get a blood count and haemoglobin
done as well. Eat plenty of fresh fruits and vegetables. Drink plenty of water. Masturbation
will not cause this. Don't worry.