I had a couple of bumps on my hand, they were white and have gone now, at the same time I had a mark on my foot. This has red, but has now gone purple and is slightly swollen.
I assumed it was flea bites, but I've never reacted before and I think different critters are responsible for hand and foot.
They all appeared after I spent an hour or so, talking outside with a neighbour in the evening. I was wearing flip-flops and we were being bombarded by flying beasties.
I'll attach a photo of my hand (which is resolving and my foot now, guessing different insects?)