No, sounds like pin worms. Check his rectum in the middle of the night about 2-3 am because that is when they harvest their eggs. You can't "really" see them moving, but you can sometimes see what almost looks like very small minute grains of white rice. If he has it real bad, you can tell by looking for a mucous like substance in the feces.
Walgreens has pin worm nedication over the counter, it is higly contagious, so even the slightest scratching of the bum will spread it to the front in both boys and girls. Also, if this is a new thing, and it turns out to be pin worms. Every one in the family has to take the medicine.
Good luck, I am nurse. Hope you find it out. Oh, if it is jock it, it will look like a yeasty thing hanging aroung and you can smell it. You can just spread lotrimin cream on him after his bath, just keep out of genitals.