What is this?

[Netty14]

So over the past 2 days I’ve gradually developed more and more welts on my legs, however one on my forehead aswell which is causing swelling!
Can anybody help?

I'm afraid I have no idea, but you might get more useful responses if you put it in an appropriate section of the site (you've somehow managed to end up in New Blog Posts ) and give some indication in your title that you're trying to find out what's wrong with your health.