Flea bites are itchy bites that tend to appear in clusters. Scratching the bites can cause an infection, which may result in a rash or blisters. Fleas are tiny bugs that don’t grow much larger ...

Both flea and ... The bites are sometimes grouped together in threes. If you’re allergic to fleas, you may develop hives or a rash. The affected area may also swell and blister.