has the tendency to get infected, nobody can predict when a cyst will get infected.it depends on your immunity, trauma (depending on its site).it also depends alot on the type and duration of the antibiotics taken.
another imporatant aspect,is the location of the cyst and the neighbouring structures.some cysts can be easily excised by a skilled surgeon giving a permanant relief, those are mostly superficial cysts.
so please get an opinion of a surgeon. simple cysts can be managed very easily, but requires local examination and evaluation if any.
antibiotics never cause pain.
hope i have answered your query.