Are Rashes A Side Effect Of Nucynta Pills?

Hi. This is Vicki. I take Nucynta ER and have for over a year. My doctor recently upped my dose from 150 to 200. I've developed a rash on my neck....could that be a side effect of Nucynta? The only other meds I'm on is Liothyronin SOD, 5 mg 2x day and Levothyroxine 112 mcg, 1 per day. Sometimes a random Excedrin Migraine.