Serkan,
I'm sorry to hear that you have this infection. Herpes zoster is more commonly called
shingles, a skin condition caused by a virus. Shingles can infect anyone, but it's especially common in post-transplant patients while their immune system is suppressed. It's important to get treatment, which may be with anti-viral drugs.
You'll find more information about it if you use the word "shingles" when you search Marrowforums or other websites.