My son has had tonsilits twice. Now he has red spots on the top of his mouth and one puss-filled spot on his left tonsil. Is he getting tonsillitis again?

Probably. Without seeing his throat, it is hard to know for sure but what you are describing sounds like pharyngitis and/or tonsillitis. Unfortunately, there is no limit to the amount of times you can have this infection.
Maybe. This may be early tonsillitis or may be a simple viral infection that will settle down without causing further symptoms.If the kid has no fever and is eating and drinking normally, you can monitor this at home.If it becomes more symptomatic, have it evaluated.
Tonsilitis. He has tonsillitis again if he has pus on the tonsils. We expect children to be sick 6-12 times a year because they have not reached adult levels of immunity.

Related Questions

Certainly have tonsillitis or strep after two weeks of a cold I now have white spots and SWOLLEN tonsils, what to do till I go todrs tomorrow 4swelling?

Ibuprofen. You can take up to four 200mg pills 4x daily. When you see your doctor they can talk about prescription medication such as antibiotics and possibly oral steroids for pain/swelling. Read more...
Throat. Hi don't wait until tomorrow. Go to an urgent care or ER. Have them do a throat cx and a blood test for mono. Read more...