“Other conditions that might resemble canker sores include oral thrush, which is a fungal infection, and leukoplakia, which are white patches in the mouth often linked to smoking,” she says.

Diagnosis: Symptoms characteristic of tonsillitis are white patches or redness at the back ... Best humidifiers 4. Canker sores 5. GERD 6. Peritonsillar abscess 7. Laryngitis 8.

Canker sores Canker sores are small yellow or white ... It can cause white, lacy patches on the mouth and gums that may become painful open sores or red patches, Silverstrom says.