The swelling you described seems to be either lymph
node or enlarged right parotid or swelling from right parotid gland
You must consult an ENT specialist
1. get examined and get a proper diagnosis
2. take a course of antibiotics as it is a small duration swelling , most probably because of infection, and the antibiotic will depend on the diagnosis.
3. take antiinflammatory medicines in addition too.
Lymph nodes can be giant and cystic too if they have infection in them.