sometimes the blisters can affect the whole dermatome, all the way from the specific dorsal root ganglia it reactivated in. you see the classice belt around the waste. I had mines at 20yo, i was defintely stressed from school. Mine was only 10 lesions orginally it was fused from more blisters. but the effects of it was that it affected the whole dermatome, and i was left was permanent scars(same shape and size of the original blisters), numbness, and hypersensitivity on the area of skin. People with low immune responses can get repated attacks, but it still uncommon though. its not even understood why they reactivate in some and not others. with the related HSV1 and 2, they reactivate quite regurlarly