Bumps on roots?

I've had these on this root for awhile, but it never seemed to be doing any harm, but I am curious as to what they are. So if anyone knows?

Day 35 now, but these have been there for awhile in a DWC using stealth hydro nutes started under almost 200 watts of CFL now under 150w HPS

looks like a gnarley root to me!

They look awesome. I've had em so thick they broke thru the net pot!

Looks like new roots forming.