What’s in my stems? Barnacles? Pest? Primordia?

[Lajgig]

Hi everyone! Glad to be a part of this community.

Would anyone care to help identify what those spots are on my stem? They appear to be part of the plant. Based on some quick research it could be barnacles, pest, or air roots. However I’m not sure if any of those is a concern. If they are, identifying what exactly is going on can help me find a solution.

I am running a DWC set up. GH flora series. Silica. Cal mag. And Rock Supercharge root tonic that contains beneficial bacteria

 

[FourthCity]

Its just normal stem. The little bumps are basically just aborted roots, they taper off as they get further away from the source of moisture and nutrients. (Assuming they aren't moving and won't come of by gently wiping with a damp cloth)

 

[crossfader]

What's up with those leaves in that pic? Can't tell if it's the light or if there is an issue there. Nute residue? ✌