Mosquito bites take on two different forms depending on how long the mosquito was sucking the blood for. They’ll either be a small circle-type shape, or a bigger, more elongated blob. It goes without saying that they’re extremely itchy, and scratching them will only make the itch worse. Flea bites are easy to identify because the flea will generally bite multiple times in the same area. The bites are small, somewhat hard, red, and extremely itchy.Bites from head lice can look very similar to flea bites. However, you’ll be able to distinguish them because they’re usually contained to the head, back of the neck, and behind the ears.