Wise Mumsnetters, what should I do? (Gross picture included.)

[SapphireSeptember]

Infected mozzie bites, now I've got two huge blisters, my ankle is swollen and my skin feels all tight and tingly. What should I do? )I had an infected flea bite in January but it wasn't this bad, I just phoned the doctor and got anti-biotics.) This had a plaster over it, but the blisters weren't there before, and I felt a bit sick when I took the plaster off.

I’d 111 that…..can you draw around the red patch with a biro to help assess how quickly it’s spreading?

Thanks! Just filled in the 111 online form, someone will phone me back (soon, I hope.) Bloody hell, it wasn't that bad yesterday, and the bites had been there a few days already. I touched the plaster and something was squishy underneath it, so I peeled it off to have a look.