- Raised red patches inside or around the mouth.
- The small cluster of red patches later turns into fluid-filled blisters called as 'Cold Sores'.
- 'Cold Sores' ruptures then merge with each other and form ulcers.
- They are Painful, burning and tingling in nature.
- Sore throat
- Increased Salivation
- Swollen gums
- Foul breath