Hello,
That is a pus follicle in the left tonsil in the picture. Follicle(s) usually occur in the tonsils if there is a long standing infection (whether symptomatic or not) in the tonsils.
If you have associated throat pain then you need a proper consultation. Occasionally there may be associated sinus problems which lead to long standing tonsil infection and throat issues.
Have proper amount of fibre and water in diet for dealing with constipation.
Next Steps
1.BETADIENE gargle
mix one(1) tsp medicine in half(1/2) cup lukewarm water and gargle 3-4 times daily.
2.Consultation