Flea or tick bites can sometimes trigger an allergic skin reaction, especially in sensitive people. The rash may appear as red, itchy bumps, swelling, irritation, or widespread allergy-like patches over the body. Continuous scratching can worsen the inflammation and increase the risk of skin infection. In some cases, reactions may become stronger if multiple bites occurred or if the skin is highly sensitive. Keeping the skin clean, avoiding scratching, and wearing loose cotton clothes may help reduce irritation. Cool compresses and regular bathing may also help calm itching gradually. Pets and bedding should be cleaned properly because fleas and ticks can remain in the environment and continue causing bites. Washing clothes, bed sheets, and blankets in hot water may help reduce re-exposure. Allergic rashes sometimes need antihistamines or other medicines, but treatment depends on the severity of the reaction and whether infection is also present. Avoid applying random steroid creams or harsh lotions without proper medical advice because some may worsen irritation. Seek medical attention urgently if you develop fever, breathing difficulty, swelling of the face or lips, pus formation, severe spreading rash, or dizziness after the bites.