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Well, you won't like it much, but the 1st thing you should do is research the real thing. Go google that bad larry, and check out the image results (keep a good time gap between research and meal times for safety sake)
May the squeamish skip this:
Spoiler:
BOILS!
Looks to me like the skin is inflamed around the central point, which is either excessively red (almost blood, but a bit muted) or with what looks to me like a hardened greyish tan lump. Having seen 1 first hand (a buddy at school, poor guy... lol) the head on his particular case was white as a sheet. If you choose to be a tad more detailed, a "lanced" boil could range from liquid that is clear to yellowish (infected) to cloudy white.
Yuck...
Google search terms:
Skin Boils
Lanced Boils
Painting a boil? I would take a tiny dab of PVA glue and put it on the model, as the raised point. Then, I would thin down a red wash. Cover the general area of the boil, let dry. Next layer, slightly smaller area, working your way to the center. Lots of thin layers here. By the time you make it to the center, it will be plenty red enough to add a touch of color to the center, and detail as you see fit.
SORES!
Similar scheme, except the area of skin agitation is smaller, and the central point is larger. Imagine a coin on your arm, if you will. Now fill that with a reds to tans (a bit scabby).
Google search terms:
Open Sores
Painting Sores? Same as boils, except adjust the sizes to the difference in affliction.
That's all I get from the Google search. It's gonna take a fair bit of practice to get right, and the ability to blend and/or glaze properly wouldn't hurt either.
Good luck.
Why is it that only those who have never fought in a battle are so eager to be in one?