Its probably just edema trapped in the lymph vessels. I’ve written a ton on it, but it appears never wrote a thread on it. Many of us have narrow lymph vessels. When we use PE methods that start to move a lot of edema into the skin, it then has to drain out through the lymphatic vessels into the lymph system. Sometimes the smaller vessels get overloaded and “pinch off” some of the fluid resulting in pale, wormlike strings with lumps along it.
The answer is to warm it up good, then “strip” the vessel toward your belly, use your finger and press very firmly. If its a lymph “clog”, it doesn’t hurt, unless its been clogged for days, then it gets sore. The longer its been clogged, the harder it is to get it moving again.
Before I understood this, I got it, and left it for about a week. I needed to use low vacuum pumping to get it moving again, and then strip it toward my abdomin. I still get it easily if I get any edema from PE, but now I strip it down immediately and its no longer a problem.