“Flea bites often result in small, red bumps, with a ‘halo’ around the bite center,” says Jim Fredericks, Ph.D., a ...

Then, shortly after, the following symptoms can develop at the site: However, if you are allergic to fleas, symptoms can become more severe, including: Allergic reactions to flea bites are rare ...

How can you tell if a bite or sting is serious? According to Pramod Kelkar, MD, an allergist and immunologist in Maple Grove, Minn., reactions to insect bites fall into three categories ...