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Flea bites are most common on areas of the body with tight clothing, especially the lower legs & around the waist. The itching of flea bites is caused by an allergic reaction. Sensitivity to flea bites varies between people; children often have especially severe reactions. In sensitive people, the bite is often surrounded by a "halo" of red, irritated skin. Household pets, cats & dogs, are the main carriers of fleas in the US. Pets & pets' bedding material should be kept clean to control fleas.
Picture from PHIL/CDC, text paraphrased from several sources on list below.
