This lump may just be scar tissue, as a result of the tick bite. The lump could also be due to a vaccine reaction and although somewhat rare, vaccine sarcomas do occur in dogs. Because your dog seems to be feeling fine and the lump is not bothering him, I would not worry but checking with your vet is always wise.
Dr Carol Osborne, DVM
why after a year would that happen?feels like it full of fuild will it need 2 be looked at or drained?