what causes itching on your back
Warning. Itchy upper back skin may be caused by an allergic reaction to medications. If you take medications, talk with your doctor. Drugs that commonly cause this issue include antibiotics, narcotic pain medications and antifungal medications, according to MayoClinic.com.
Nerve-related itching is also called neuropathic pruritus or neuropathic itch. The skin in that area of the back becomes hypersensitive. Being rubbed by a shirt tag or having overly dry skin can set off an episode of prolonged itching to that localized spot.