Itch. The normal reaction to an insect bite, including fleas, is an inflammatory reaction at the site of the bite, which appears within minutes and consists of itchy local redness and swelling. A delayed reaction involving the same signs and symptoms may follow sometimes.
Fleas. Flea bites may be clustered into 3 itchy bumps that bleed ; blanch (turn white) when you press on them. They tend to be found at skin folds (breast or groin) ; folds of joints (ankle, knee, elbow, axilla) as well as legs. A rash ; swelling can occur as well as secondary infection from scratching. A skin biopsy is sometimes needed for accurate diagnosis.