Both of my tonsils have been surgically removed more than 8 years ago. Recently I observed a lump slightly behind the spot of my left removed tonsil. It does not cause any pain and the colour is no different than the usual colour inside our mouth. There's no problem in swallowing. Just presence of it makes me conscious. It is there from past two to three months. Please tell me what it could be. Just afraid if it is throat cancer.