This is the best advice i can offer- you HAVE to catch one of these worms and id it! If its some harmless worm that feeds on decaying matter, its a nuisance & not a big deal. If its in fact some type of parasitic worm, it needs to be dealt with quickly. If it has a sucker-type of mouth, its a leech and you will have an epic battle on your hands. You can do a quick search on here for my leech thread if your interested in what happened- type in 'What is this???' by jlk & the thread should pop up. Leech eggs, as I have since learned, can not be destroyed by chemicals, heat, cold, drying, or anything else maybe except for burning. Good luck & I truly hope this is not something serious!!!!