Yes. Small dense LDL. It accumulates because the receptor in the liver will not take it back like it is supposed to (LDL is an energy carrier and after it drops its lipid load is recycled by the liver) because of the receptor. So they accumulate in the blood. LDL is critical to the human body, yet for some reason the medical community thinks we need to lower it to as low as possible. It is essential for brain function as well as most of the other organs. All because of some old flawed studies a generation ago we have statin drugs trying to lower it.

I don't worry about it because I quit eating the things that cause the oxidation which causes the small dense LDL. High blood glucose spikes are a major contributor to oxidation.

See some of Dave Feldman's lipid energy model information. It is a hypothesis at this time but a lot of it is derived from known, established science.

https://www.youtube.com/results?search_query=dave+feldman+lipid+energy+model+

This one is only six minutes long and is a short description of it.
https://www.youtube.com/watch?v=C1T-7-6bpz8