When they bite the lay it on your skin w/ a lil wound there to start off with. When you scratch it it gets in-beded in your pores and it then grows you do the rest of the work for it. Id hate to be the girl that got bit on her nipple. She got the larva growing in the pores of her nipple. Growing and feeding off the fat stores and milk glads those bitches where huge too!!! I have to find the right up on it , its grose!!!