Those white colored mites you see on your ball python and crawling around in the tank are wood mites. Unlike reptile mites (black/brown/red mites), your ball python is completely safe from them because they feed on decomposing wood, not reptiles.
Wood mite magnified



You’ll oftentimes bring wood mites home with you when you buy wood based substrate for your ball python (aspen, bark, etc). You can find them moving slowly over the wood in the cage, near the water bowl and on your ball pythons fecal matter as well. Although they pose no harm to your ball python, they should be placed under control or eradicated because they can expand their colonies very quickly. I’m sure you’d rather not see little white bugs crawling all over your ball python, regardless of whether they’re harmless or not.

http://www.rcreptiles.com/blog/index..._white_bugs_be

I got this info off a website posted ^^^ take a look at it. It has some interesting facts about what mites are, what they look like and how to take care of them.