Mosquitoes feast on me... and apparently my son has the same allure. This article in Smithsonian Magazine gives some of the reasons why this might be (aparently 20% of people are extra appealing to mosquitoes) and as a bonus, has an extremely creepy close up of a mosquito sucking blood (eeeeeeeek)!
Of those 20%, an even smaller percent are unlucky enough to have heightened reactions to the bites they receive. Some call it an allergy, some call it skeeter fever, I call it rotten luck.
After my husband and I repeatedly freaked out (okay, maybe I did most of the freaking) about the HUGE hard red welts and ever expanding red rings that felt hot to the touch around our son's bites (he got one next to his eye once that ended up looking like he'd gotten punched) I took him to see the doctor. She recommended what you would expect... on ounce of prevention... BUT she also suggested this super cool topical treatment I'd never seen anywhere else, which I really think is amazing. Note, the sooner you treat the bite the better this works, it's not so helpful with old bites.
Purchase a jar of Bromelain & Papain Veg Caps. Bromelain is an enzyme found in pineapple (some use it for promoting implantation, so if you are in the world of fertility treatments you may have heard of it!) Papain is an enzyme found in papaya. Both these enzymes are proteolytic enzymes, which is a fancy way of saying they help break down protein. Since the reaction from mosquito bites (especially when it is an extreme reaction) is mostly about the reaction a person's body has to the protein in the saliva from the mosquito (shutter appropriately here) putting these enzymes over the spot where the saliva is can help break the spit down so your body doesn't have as much to react to.
It really does work wonders! The doctor recommended just mixing it with water to make a paste, but I started using vaseline so it'd stick longer and better. Then I decided for good measure I'd use over the counter hydrocortisone ointment so I'd be breaking down the mosquito spit AND suppressing the inflammatory/allergic response of the body. Not quite as natural, but worth it for me when it comes to my little guy.
If you or someone you know has these reactions give it a try. It's not perfect, but it seems to keep things way more in check.