I had shingles about 4 or 5 years ago up the back of my head, and recently it has become painful and itchy. I have used T-gel shampoo and DH sees nothing nasty living there, but I have had it maybe a month now. I do have some raised bumps in places that are painful - is it shingles again? Or pain after shingles? Or something else? I did get it after I used freezing cold water to rinse my hair through - would that aggrevate it? Thanks x