Most rashes are not dangerous. Many rashes last a while and get better on their own. It is therefore not unreasonable to treat symptoms like itchy and/or dry skin for a few days to see whether the condition gets milder and goes away.
Shingles is a painful skin condition caused by a reactivation of an infection with the varicella-zoster virus (VZV) that causes chickenpox. Even before skin lesions appear, the pain of shingles can be severe. The pain is often described as a burning sensation of the skin with heightened sensitivity.