Is there a particular kind of rash that is red, pimply, sometimes itches, and is painful?

Shingles: Shingles is a viral infection that causes a painful rash. Although shingles can occur anywhere on your body, it most often appears as a single stripe of blisters that wraps around either the left or the right side of your torso.

Many: A variety of rashes can cause this. Fungal infections, bacterial infections , eczema and shingles are possibilities. Location may be helpful.