I did not have a rash or itching when I tried it, BUT I remember reading that if you have one, it should be reported "immediately" to a doctor as it may be an indication of a relatively serious side effect.

The statement below is from drugs.com regarding Cymbalta.

"Get emergency medical help if you have any of these signs of an allergic reaction to Cymbalta: skin rash or hives; difficulty breathing; swelling of your face, lips, tongue, or throat."

I think if it were me, I would discontinue the Cymbalta until you talk to your doctor.

Good luck and keep us updated....