Thank you for your medical query at AskTheDoctor.com
I understand your concern.
From what I can see, there is a puss-filled swelling inside the mouth on the right side which occurs mostly due to a bacterial infection.
If the swelling keeps increasing in size it may have to be drained. I will advise you to get it physically examined by your physician who can recommend you both oral and topical antibiotics. The infection because of its proximity can cause a fullness like feeling in the ear. I will advise topical application of Metronidazole ointment as well as a course of Amoxycillin with a recommended dosage of 500 mg twice daily for adults for 7 days.
The sooner you can start the treatment the better.
Hope this was helpful,
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