Sounds like it is muscle adhesions or a wicked muscle spasm. Adhesions feel like a hard kind of rippled muscle. Injury and constant muscle spasm can cause them. Sometimes they can feel like a fibrous "egg" under your skin.

If your chiro or Dr. Really don't know what they are maybe another opinion or treating dr is in order, and like yesterday.

Adhesions can occur when you have an injury or by repeated muscle spasms. You have to identify all the possible fibrous adhesions in the muscle, then perform some soft tissue therapy on the muscle to break up all those fibrous adhesions in the muscle, muscle sheaths, tendons, ligaments and fascia...In your case it seems like muscles only.

It will probably be a little unpleasant (sometimes hurts like heck) but worth it in the long run.

You take care and get well.