Has she been evaluated for porphyria? The testing should be done when in a flare.
That is the only thing that comes to mind for me.
You might get some blood work done when she is in a flare, because erythemia nodosum can look like that too:
http://www.google.com/search?q=eryth...w=1173&bih=763
http://en.wikipedia.org/wiki/Erythema_nodosum
But I suppose this would have been looked for already?
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Weezie looking at petunias 8.25.2017
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