Hello and hope you are doing well.
The receding painful gums
and the blister may not be related to the throat
infection. They can occur due to local or systemic causes. Local causes like tooth infections, tooth abscess or periodontal disease. Some medications like dilantin and calcium channel blockers like nifedipine can cause swollen and painful gums. They are more common in smokers, in people with poor dental hygiene, with vitamin deficiencies and are known to be associated with stress.