I Have Been Receiving A Script For Cyclobenzaprine For Approximately

I have been receiving a script for Cyclobenzaprine for approximately four months. Dosage 2x a day for neck pain. Recently I have been breaking out what I thought was a rash/or hive on my scalp. Over the last few days it has gotten worse and now it appears to look like encyema. at times in is raised and red and actually burns. I have been under a lot of stress lately and I brushed any thoughts off thinking it could be an allergic reaction from the meds. Reading up on this drug, I found my condition to be a rare side effect. Is this true? Is it dangerous to continue taking the medication?