Flea Bites: Identification, Treatment, and Prevention

Fleas bite humans opportunistically, especially when pets are infested.

Bite Appearance

• Small (2–5 mm), erythematous papules with a central punctum.
• Often in groups of 2–3 ("breakfast, lunch, dinner" pattern) or linear clusters.
• Predilection: ankles, lower legs, waistband, axillae.
• Intense pruritus; halo of erythema common.

Complications

• Secondary infection: Scratching → impetigo, cellulitis (purulence, spreading redness, warmth).
• Allergic reaction: Papular urticaria (large wheals), rarely anaphylaxis.
• Disease transmission: Yersinia pestis (plague), Rickettsia typhi (murine typhus), Bartonella henselae (cat scratch disease) – rare in developed areas.

Treatment

• Wash with soap and water.
• Cold compress for itching/swelling.
• Topical corticosteroid (hydrocortisone 1%) or calamine.
• Oral antihistamine (cetirizine, loratadine) for pruritus.
• Antibiotics if infected (topical mupirocin or oral cephalexin).

Prevention

• Treat all pets with vet-approved adulticide + IGR (insect growth regulator).
• Vacuum daily (discard bag); wash bedding at 60°C.
• Yard treatment if outdoor infestation.
• Professional pest control for severe cases.