Our expert says:
It's very difficult, if not impossible to guess a cause when three different specialists have not been able to see it with examination. In my reading, the first thing I'd have thought of is a nerve issue, or perhaps a myofascial problem. The extreme sensitivity to touch early, plus the previous history of a tear would suggest that to me. However, to be so bad that it can't even be touched is very unusual. That happens sometimes with compartment syndrome, but this is a common condition and they would almost certainly have picked it up if it were the case (besides which, the symptoms don't sound similar even to me).
So I'm afraid that would have been my first instinct. I don't know of any autoimmune disease that would cause this in only muscle, so I'm skeptical about that. I don't know of acid levels that would do the same - because it's isolated to one muscle, and in one specific place, my feeling is that it's likely to be in the muscle, or in the nerve that supplies this muscle. More than this, I'm afraid I can't guess at.
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