I am just asking.

Gout is a genetic issue. It is aggravated by overconsumption of some foods high in purines. But it can come on when the white blood cell count falls after being elevated for whatever reason, and those purines are trying to get metabolized off.
It comes during some chemo treatments, and also when there is tissue damage or poor circulation. A person with gout is lacking an enzyme which then results in uric acid building up in the body.

I have had one attack of gout, and while my blood levels of uric acid are moderately elevated, that is the only time I had one.
I have PN in the feet, but also have OTHER issues which overlap with it.

I only ask because I think sometimes people can have overlapping issues, and need to keep an open mind. Since you expect pain from your RSD... you may overlook something else if it occurs. If you have had serum tests for uric acid levels in the past, and they were normal, then gout is not likely. It still can occur in normals in the situations I listed above.

There is also pseudogout, which is not uric acid causing the inflammation but a calcium salt instead.
http://www.arc.org.uk/arthinfo/patpubs/6051/6051.asp

Some common drugs can precipitate gout...the most common are thiazide diuretics used for swelling/edema or for blood pressure, and niacin.

Whatever, I do wish you a speedy resolution to your new symptom. And welcome to NeuroTalk as well.