Tigerworms/earthworms with abscesses?

[Cap10Squirty]

I've seen this before on a few worms that I have caught...I'd like to know what it is as well.

[victorsgrace]

My guys are wildcaught themselves and are around 3-4 years old, when I found them. They get fed wild beetles and eartworms once i a while from wooded areas and they seem to be doing fine

Thank you for your opinion, but do you know what those things are a symptom of? I'd just like to know, cause I've never seen it on any of the smaller earthworms I used to catch, where I found them.