Slightly off topic

So as the title says this one is a bit off topic, but I have to ask. If a friend of yours has a "boil" that looks something like this...














Do you A) Poke and prode at it. B) Stay clear of it and suggest he/she see a doctor?

I must admit I'm bad about picking at scabs and pulling of peeling sunburned skin, but that...that I wouldn't touch.