I am currently travelling in Thailand. Two nights ago we were sitting outside, I didn't use insect repellent. My foot started to swell when we were sitting outside. Next morning the swelling was a bit better but red spots appeared over night. This is two days ago and the food is still swollen and has dark red patches. It is not itchy and doesn't hurt. But it looks very bad and a blister appeared. It might have appeared due to rubbing on the shoes. The other foot is also affected but not as bad