its coz f cheeck biting...or some sharp thig impinging on cheek or crown not placed properly...first get t d root cause...if its painful apply dologel...3times a day before an after meals

Hello, It looks like you are having a ULCER. You can apply MUCOPAIN GEL over that area. Within few days it will heal. Don't worry. Hope you find this helpful. Thanks for using practo! Regards Dr.Ravin Shah

It could be a traumatic ulcer, usually results after a cheek bite. If it doesn’t heal in a week then please visit your nearest Dentist for further evaluation.

To give a rational opinion about what your problem actually is the basic requirement will be a proper clinical examination or at least a look at the clinical photograph of the affected area. It'll be of great help to us if you can post such a photograph on Practo for a better evaluation from our side. You should not be using topical ointment for a very long time because they do not cure such ulcers or lesions but only provide temporary symptomatic relief. If a small wound or an ulcer inside the mouth does not Heal within 7 to 10 days then you need to visit a dentist so that the secondary factors for the delay in the healing can be evaluated and the right treatment can be instituted as soon as possible. Regards.