1. Take a Benadryl. This helps with the itching but don't take if you have only 1 or 2 bites.
2. Put toothpaste on them. Calamine lotion is better. But toothpaste can help with the itching too.
3. Put aloe on it. It helps with the itching and swelling, and also helps them heal.
4. Treat them with salt water. Or really, salt PASTE. Pour a little bit of water on the bite, just to get it wet. Then rub some salt on there.
Source: Lifehacker