What are muscle knots? An exercise physiologist explains what those tight little lumps are and how to get rid of them
When your muscle gets damaged—even just a little—it can cause inflammation in the bands of muscle and the fascial layer above. And that clump of inflamed tissue is a myofascial trigger point. The little lumps are typically tender to the touch and can limit your range of motion or lead to pain during various movements.
Source: Medical Xpress