The blisters of herpes zoster turn black, may be the emergence of blood blisters, combined with bacterial infection, is a manifestation of the more serious condition. Herpes zoster normally manifests as clarified, transparent blisters, if combined with bacterial infection may appear cloudy and yellow pus, if the appearance of blood blisters may appear blisters turn red, red purple, black purple performance, suggesting that there is bleeding around the rash. In this case, it is recommended to closely monitor the blood routine and CRP and other indicators of infection, strengthen the nutritional support, and actively prevent infection. Generally herpes zoster a person has only one attack in his life.