since you are just getting over a cold it is certainly possible that it is evidence of an infection on your tonsil. one concern would be strep throat. however if you have strep your throat is typically quite sore with fever and oftentimes swollen glands in the front of your neck. if you feel fine otherwise strep throat is less likely. however if it doesn't go away after a few days get your doctor to check it out. another possibility is a tonsil stone. however since you had a cold recently the above is more likely. but here's more information about tonsil stones
i have a white spot about the size of a large grain of rice in the back of my throat on my tonsil of the left side. its a small white spot but it is very easy to see upon emamination. i have just gotten over a cold that did start with a very sore throat but that was about a a week ago now. there is only a spot on one side of my throat. i'm worried its some kind of infection. i can touch the area with my tonge and it is much warmer on that side of my throat than the other side. it is mildly irrated.