Erythema Multiforme Querey?

So I just got diagnosed with this lovely immune system disorder, and being so lucky as I am, I fall into the <10 % who have it due to medications. That same 10% also tend to develop to the major form, with mucous membrane sores and lesions. Oh joy of joys.

So I guess my question is, if anyone on here has it, knows someone who does, or practices medicine and knows a bit about it...

What is the recurrence rate? I saw on dermznet that it can have multiple flare ups a years for many years. But does it go into a dormant stage similar to plaque psoriasis, or is it one of those things that will trigger at any old slight? Thanks in advance.