My stomach skin is numb from mid right section to around the back. What causes this? It itches as well?

Shingles. One cause of itchiness or pain with numbness around the trunk is herepes zoster, or shingles. The sensations can occur before the onset of the classic rash. If your symptoms are located specifically across a cerain dermatome, then the cause is likely shingles or another radiculopathy.