That sounds like myofascial trigger points.

I've had Myofascial Trigger Point Therapy (MTPT) "Massage" (and I use that term loosely ) done by certified MTPTherapists, and tried by physical therapists/massage therapists who weren't certified in MTPT, and it made all the difference in the world. As I understand it, this is because the PTs & MTs get an introduction/overview of it consisting of as few as 1-2 hours of MTPT training, while the certified therapists undergo hundreds of hours of training, exams, etc.

You can find a certified therapist by goggling: certified myofascial trigger point therapist [city or state]

Doc