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Mouth Lesions in Children

Medically reviewed by Last updated on Mar 3, 2024.

What is a mouth lesion?

A mouth lesion is damaged tissue that may have a change in normal color. It may look like an ulcer, a raised bump, or sore. Your child may have one or more mouth lesions that may be painful.

What causes a mouth lesion?

The cause of your child's lesion may be unknown. A mouth lesion may be caused by trauma from biting the inside of the mouth or brushing teeth and gums too hard. It may also be caused by a retainer or braces that rub against parts of the mouth. A viral, bacterial, or fungal infection can also cause a mouth lesion. Mouth lesions may be a side effect of certain medicines.

How is a mouth lesion diagnosed?

Your child's healthcare provider will ask when you or your child noticed the lesion and if the lesion's appearance has changed. The provider will also ask if your child has any other symptoms such as a fever, headaches, or chills. Blood tests may show if your child is at higher risk for mouth lesions. Your child's healthcare provider may rub a cotton swab on one of the lesions and check it under a microscope. A sample of a lesion may be sent to a lab for tests.

How is a mouth lesion treated?

Your child's mouth lesion may go away on its own. Tell your child's healthcare provider about any medicines your child takes. Treatment depends on the cause of your child's lesion. If an infection has caused the mouth lesion, medicine be needed to treat it. Your child may also need any of the following:

How can I manage my child's mouth lesion?

When should I seek immediate care?

When should I contact my child's healthcare provider?

Care Agreement

You have the right to help plan your child's care. Learn about your child's health condition and how it may be treated. Discuss treatment options with your child's healthcare providers to decide what care you want for your child. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.