Then you’ll have a better sense of the over-the-counter (OTC) products that can help.

When to Call 911

Insect bites can sometimes lead to a serious allergic reaction calledanaphylaxis.

In the worst-case scenario, they can be immediately dangerous because of the possibility of anaphylaxis.

Mosquito biting.

Getty Images/Oxford Scientific/Roger Eritja

Avoid scratching an insect sting or bite, which can make symptoms worse and could lead to complications.

Keep the wound clean but avoid using home remedies on the wound.

Without immediate treatment, there is a risk of death.

Widow spider.

Gunter Ziesler / PhotoLibrary / Getty Images

If you see or feel any of those symptoms,call 911 immediately.

Call 911 first, then use the EpiPen (or whichever brand the person is carrying).

Keep in mind that rare conditions also can follow an insect bite.

Baby with hives

princessdlaf / Getty Images

Fleas can carry typhus and plague, and deer flies can carry anthrax in North America.

2020;102(6):355-362.

DermNet NZ.Arthropod bites and stings.

2018;3(Suppl 1):e000530.

2022 Aug;106(2):137-147.

2023 Aug;38(4):505-509. doi:10.1002/jca.22045

National Health Service.Bites and Stings.