I have canker sores in my mouth that could be an allergy or a virus. if it's a virus, how long will this take to clear up? thank you.

2 weeks: Viral canker sores are a variation of the chickenpox virus and usually take about 2 weeks to heal. Do not use anything caustic on it. Warm salt water rinses and/or baby teething salves are good.

About 2 weeks: Canker sores are caused for an unknown reason, but cold sores are caused by a virus (usually a herpes simplex virus). You can buy different ointments at the drugstore to make them not hurt as much, but it usually will take 10-14 days for them to go away.

Virus: Canker sores are not typically caused by viruses, but there are viruses that can cause blister like lesions in your mouth and they take about 10 day to heal and you would contagious.

2 weeks: canker sores are viruses and take 2 weeks to heal usually. other sores may look like canker sores but may be other viruses are injuries. see a DDS

Canker sores : Canker sores are the most common oral lesions. Individual ulcers typically last 1-2 weeks. The condition is idiopathic (cause is not known) recurrent aphthous ulcers is usually self-limiting. If concerned see your dentist after 10 days or visit today for laser immediate amelioration.