What's myogelosis is it trigger points?

Muscle pain: I am not familiar with that term. Perhaps you are referring to fibromyalgia, a condition involving muscle and joint pain as well as fatigue. The syndrome can include anxiety or depression, a greater sensitivity to pain, resulting in trigger points, chronic headaches, stiffness, and other symptoms. See your doctor for an evaluation if you are concerned that you have this condition.

Tissue density: Strictly it is increased tissue density in the muscle but many soft tissue specialists and acupuncturist use the term to refer to an increased tissue density even in the subcutaneous tissue. Again some use the term interchangeably with a trigger point, but in reality it doesn't. It could be a tender point without any particular "triggered" accepted referred pain pattern which defines a trigger pt

Knots: "hardened areas or nodules within muscles, especially the gluteal muscles." can occur after a variety of conditions especially antibiotic injections. Of no significance

Not exactly.: There are histological changes of fibroconnective tissue within muscle in the case of myogelosis. One good theory is that they are the result of untreated trigger points and difficult to treat. Sort of like wounds and scars. http://www.ncbi.nlm.nih.gov/pubmed/10398386 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2774893/