Pet owners know when a flea infestation hits because dogs and cats show visible signs of irritation. You can have a flea infestation in your home even if you don't have a pet, as rodents and possums are carriers. Flea bites appear on humans as areas of red dots and are normally just itchy and uncomfortable. Some people may develop allergic reactions to flea bites. Here are some tips on how to get rid of fleas in your home.