Pityriasis rosea associated with pegylated interferon alfa and ribavirin treatment in a patient with chronic hepatitis C.

BACKGROUND Pityriasis rosea is an acute inflamatory skin disease that the etiology is unknown but some viral agents like human herpes virus-6 and 7 and drugs are suspected. CASE REPORT A-58-year-old man with chronic hepatitis C was being followed up in our hospital. Pegylated interferon (PEG-IFN) alfa-2b (100 μg per week) and ribavirin (1000 mg/day) was started. In the third month of this treatment, the patient was diagnosed with pityriasis rosea (PR), which was confirmed by skin biopsy. PEG-IFN alfa-2b treatment for chronic hepatitis C was maintained and no therapy was given for PR. The lesions spontaneously improved within 5 weeks. CONCLUSION Interferon and ribavirin have several cutaneous side effects. Our case is the first case of PR, emerged in a patient with chronic hepatitis C while receiving PEG-IFN alfa 2b and ribavirin.