Oh dear, that does sound rather worrying to have a lump growing bigger on your tonsil!
Most tonsil lumps tend to be benign however, such as an area of infection, scarred tissue for even a tonsil stone. It’s a pity you don’t have a photo for us to take a look at.
But in view of its enlarging size and the fact that is is just on one side, I would strongly advise you to have it thoroughly checked out by an ENT specialist. Rarely, tonsil lumps may turn out to be more sinister in nature, such as lymphoma (lymph gland cancer) or squamous cell cancer (linked to smoking and Human Papilloma Virus exposure).
You haven’t really told us much about any other associated symptoms like a sore throat or difficulty swallowing when eating your food. Unexplained weight loss, fevers and night sweats are also symptoms to be concerned about.
Please go have it checked out urgently by an ENT specialist who will likely need to perform a nasal endoscopy to examine the full nose, throat and airway areas, conduct blood tests, and possibly a scan.
