should I be worried help me out MMJ family

So I noticed this on the bottom of my stem on at lest 3 of my babies, some background on them they are BlueDream flowering at week 4 indoor. Not to sure what it is but my guess maybe mold any help would be great thank you all.

First grow I assume? That is your stems hardening off. A good, normal thing.

No worries

Totally forgot to say that this was my first time growing, I though it was gonna be easy but caught me off guard. Its a science to grown some nice flower but Im learning and enjoying it.

Here are some pictures of my babies at 3 weeks flowering had some basic first time grower issues such as nut burn but you learn from mistakes they seem to be doing well.

Bugeye said:

First grow I assume? That is your stems hardening off. A good, normal thing.

Click to expand...

Oh, a little further along than I thought. Already hardened stemmed, now just scaling. Still normal!