Multiple aphthous ulcers on non-keratinized mucosa that heal in 2u20133 weeks u2014 diagnosis:

Aphthous ulcers (canker sores) appear exclusively on NON-keratinized tissue (labial mucosa, floor of mouth, ventral tongue). They heal in 2u20133 weeks without scarring. HSV presents on keratinized tissue with clustered vesicles. Treatment: hydrogen peroxide rinse, avoid irritants.