When you get an insect bite or sting it can sometimes become itchy and swollen because your body has a similar reaction to the bite as it would to an allergen.
Antihistamines can help to reduce the itching and swelling in some cases, making it easier for you to refrain from scratching and give your skin space to heal.
This is why some insect bite creams contain antihistamines as their active ingredient.
In most cases, bites and stings will be minor enough that they won’t need treatment and will go away by themselves, but if you’re ever concerned about yours you should speak to your doctor or pharmacist right away.
They’ll be able to take a look at the area and recommend treatment if it’s necessary.