2 articles · Updated · The Washington Post · May 23
A randomized 2024 clinical trial found a thermo-therapeutic heat pen reduced mosquito-bite itching significantly within one minute versus a placebo device.
Mosquito bites itch when saliva proteins trigger histamine and other inflammatory signals; experts said brief heat may interrupt itch-related nerve pathways, while cold can also numb the area and reduce inflammation.
A 2023 study of a smartphone-controlled heat device reported itch fell 57% in the first minute and 81% within 10 minutes, though one expert said the study lacked a true control.
Experts advised using only mild, localized warmth—such as a warm washcloth or low heat pack—and avoiding burns; for people with stronger bite reactions, cold compresses may be the safer first option.
Other relief options include 1% hydrocortisone cream, oral antihistamines, menthol or camphor lotions, baking-soda paste and calamine, while severe swelling, hives or fever warrant medical attention.
Heat can soothe or inflame a bite. How can you know if this remedy will actually make your itch much worse?
With our skin's 'cold receptor' now mapped, are new drugs that mimic an ice pack's relief on the way?
As climate change expands mosquito habitats, what new disease risks are emerging in previously safe temperate zones?