Cold sores and canker sores may appear similar but are quite different in terms of causes, symptoms,...
Characteristic | Cold Sores | Canker Sores |
Location | Outside mouth, on lips | Inside mouth, soft tissues |
Cause | Herpes simplex virus | Multiple factors (stress, nutrition) |
Transmission | Highly contagious | Not transmissible |
Appearance | Fluid-filled blisters | White/yellow ulcers with red border |