Obviously a wasp sting. You (or someone else) need to suck out all the venom, else it will become infected. White is venom, yellow/brown is infecting.
Reminds me of the story of Pus Sucker Bill...
A woman walks into the doctors office with a huge boil on her arse.
The doctor squeezes it, pushes it, and then looks at the hard white pus core. He says, "This is too big a job for me," so he sends her to Pus Sucker Bill.
The woman goes to Bill who looks at the bulging red, inflamed boil festering with pus and says, "This is no problem," and he proceeds to press his lips to her arse and sucks out the pus and core of the boil.
Halfway through, the woman drops a mammoth fart. Bill stops what he's doing, looks up and says "You know lady, it's people like you who make this job fucking disgusting."
