if your referring to that little knub, in the first pic, at the joint of the node ? doesnt look like much, keep a close eye on it though. Looks to me like your burning your plant, heat from those spot lights is no good. are they on any specific light schedule, could be early signs of male or hermie, but I doubt it.
Ive seen node knuckles that looked more like moose knuckles .. haha moose knuckles