My opinion: if the spots are really small and the lens is really cheap, I would buy it and let the fungi where they are. They really (really!) donīt affect pictures.

Donīt try disassemble the lens by yourself if you donīt have enough experience for that. Thereīs a good chance you ruin the lens.

If the fungus bothers you then take the lens to a very skilled technician. Let the lens facing the Sun kills the fungus but doesnīt remove its leftovers.