After years of smoking can you become allergic to nicotine?

Allergies
#1
#2

You could be allergic to the cigarettes. Try to take some antihistamine or antiallergic medications for the rash and apply calamine lotion locally.

#3

Avoid smoking, join a smoking cessation clinic to help you quit. Talk to your doctor about it.

If the rash still does not resolve, talk to your doctor about a course of steroids and see if that helps.