There are variety of foods which will help reduce the effects of mosquito bites.

Onions
Rubbing a slice of onion over your skin are often a good way to prevent mosquitoes and other biting insects as most bugs are repelled by them.

Orange and lemon peels
Just as onions can repel mosquitoes, you'll get similar results by rubbing fresh orange or lemon peels over your exposed skin.

Garlic
If you plan to embark on a trip to an area that's crammed with bugs and insects, it's advised that you simply start eating garlic several days earlier. Eat a clove or two a day .
As you sweat out the garlic odour, it repels many insects and prevents mosquito bites.

Milk

If you are feeling your skin is burning up from an excessive amount of sun exposure or if itchy mosquito bites are driving you crazy, try using a little milk paste for soothing relief.
Mix one part dry milk with two parts water and add a pinch or two of salt. Dab it on the burn or bite. The enzymes within the powdered milk will help to neutralize the venom of the insects and also help relieve sunburn pain.

Salt
To get instant relief from the itching of mosquito and chigger bites, soak the world in salt water, then apply a coating of oil .

Olive oil
The stagnant or still water around your house provides the right tract for mosquitoes. Floating a couple of tablespoons of oil on the surface of the water will help keep mosquitoes from using the water
It is however, still important to vary the water twice every week so any larvae don’t have time to hatch.

Source:
https://clitnets.com/articlecon.php?id=54

Okay....hope it works.