How long does a flea bite last? - briefly
Flea bites usually resolve within 2‑3 days, although itching and redness may persist up to a week in sensitive individuals. «Symptoms typically subside without medical intervention, but antihistamines can accelerate relief».
How long does a flea bite last? - in detail
Flea bites typically progress through three stages: initial reaction, peak inflammation, and resolution.
The initial reaction appears within minutes after the bite. Small, red papules develop as the flea injects saliva containing anticoagulants. This phase lasts from a few minutes to one hour.
Peak inflammation occurs as histamine is released. The papules enlarge, become intensely itchy, and may develop a central punctum. This stage persists for 12 to 24 hours, after which the itching intensity begins to decline.
Resolution follows the peak phase. Redness fades, swelling diminishes, and the skin returns to its normal appearance. Complete healing usually requires 2 to 5 days, although residual discoloration can remain for up to two weeks in individuals with sensitive skin.
Factors influencing the duration include:
- Host sensitivity – allergic individuals may experience prolonged itching and larger swellings.
- Number of bites – multiple bites can merge, extending the inflammatory period.
- Secondary infection – scratching can introduce bacteria, lengthening healing time to 7–10 days.
If symptoms persist beyond one week, or if signs of infection such as pus, increasing warmth, or fever appear, medical evaluation is recommended. Antihistamines, topical corticosteroids, and proper wound care can accelerate recovery and alleviate discomfort.