Thanks again!
Does neck have good blood circulation? I don't think so... I find it very hard and extra-time consuming to get rid of neck trigger points (side of the neck). For my back trigger points I can apply a lot of pressure and the pain will be severe but I can handle it. On my neck though...a slightest touch with nearly no pressure creates burning sensation in my shoulder that is simply not bearable. The progress for neck trigger points is awfully slow. It took 6 days of maybe 8-10 compressions per day in sets of 5 to reduce pain by some 30-40%, but it was a permanent decrease thus far.
Also, I think that the distance between my spine and end of left shoulder is greater than between my spine and the end of right shoulder. I am deformed...I guess. This explains why I have a whole lot more of them around my left shoulder blade, not so much about right.