Human botfly larvae, for example, burrow under your skin, forming a pus-filled pimple ... More commonly known as the sand flea. Females burrow into the bottom of your foot to slurp your blood.

Pets can pick up fleas from being outside in nature, around other animals, or when humans track in the insects ... be around your ankles or in skin folds. Flea bites can cause an allergic reaction ...