From the picture,it looks like herpes zoster. is a viral disease characterized by a painful skin rash
with blisters in a limited area on
one side of the body, often in a stripe.Diagnosis is by clinical examination, Tsanck smear, VZV-specific IgM antibody in blood and polymerase chain reaction for VZV DNA.Treatment involves oral steroids and antiviral drugs.
Pls elaborate more on the symptoms so that I can help you in a better way.
Hope it helps.