I think I probably got it on Saturday, but I first noticed it yesterday morning. At that point it was quite red and angry looking, only mildly ithcy and contained as a small lump around the but site.
Today there's a large red patch, about the diameter of a tennis ball, which is hot and hard, a small (tiny) liquid filled blister in the centre and my leg is very swollen from the ankle to about halfway up my calf. The bite is on the lower calf. It HURTS, a lot. I can barely out my foot on the ground. I've had to cancel meetings because I wouldn't be fit to drive.
But it is only an insect bite and it is only a couple of days old...