After a tonsillectomy, the main issues are usually to do with pain and rarely bleeding due to secondary infection of the tonsillectomy area. My patients are usually seen 1 week and then about a mth postop by which time the vast majority are actually fully recovered. After that, there is usually no need to be followed up.
Sounds like you might have a bit of tonsil tissue remaining which might have become inflamed again.
Just in case, please have it checked out properly by an ENT specialist as sometimes, the new lump you have noticed may be due to another problem. Most importantly, you would wish to have a malignant or sinister cause ruled out!
