The fact that shingles has crusted over does not mean that it is cured, and you still need to continue taking acyclovir. Herpes zoster is caused by the herpes zoster virus infection, latent in the patient a neuron, in the patient’s body immunity decline, the latent virus rapid development, resulting in nerve demyelination lesions, causing neuralgia, there may be blisters on the surface of the skin, broken scabs, and then healing, the entire course of the disease is probably about ten days to fourteen days or so. Herpes zoster in the onset of seven days to ten days or so, the local skin herpes can appear scabs, does not mean that the disease has been cured, so the herpes scabs can not stop the drug, you need to take acyclovir according to the course of treatment to ten to fourteen days. Herpes zoster has been scabbed, you need to protect the scabs to prevent rubbing them off, leading to secondary infections. Antibiotic ointment can be used prophylactically on the scabbed area. It is recommended that patients with shingles take medication under the guidance of a doctor and do not increase or decrease the dosage without authorization to avoid affecting the recovery of the condition.