always permanent. The peripheral nervous system does regenerate. It takes time and certain attention to nutrients to effect improvement.

We have a sticky thread above about "improvement"

Doctors have no clue generally about healing. They only identify and label.

If you try to discuss healing with them, they pooh pooh you mostly (there are exceptions).

I had a severe meralgia paresthetica...I had it for years as a result of a C-section surgery. And it did heal up. It is now a dull roar, which only stabs me very infrequently. But then I did things to enable that healing.

I would get the exact medical term for this "cyst"...
And find out what exactly makes it progressive, and permanent.

Your description from the doctor sounds a bit lame to me.
Here is a question-- and answer-- maybe you are the poster?
http://www.medhelp.org/forums/neuro/archive/16141.html

Cysts in muscle can come from trichinosis (pork parasite).

Also you can have a "stroke" in a blood vessel in the leg which then causes muscle death. The fibers do not come back when damaged this way. That muscle would be weaker, and perhaps have pain. But eventually the nerve pain should diminish.

I found using Lidoderm patches the most effective solution to my MP. Used for 2 weeks it actually put the nerve to sleep and the 100 bee stings I was living with went away. So there is something to be said for numbing it for a while. That may change the chemistry inside the nerve, and stop the pain.