Herpes zoster, scientifically known as shingles, is caused by infection with the varicella-zoster virus, which mainly invades the nerves as well as the skin and is distributed unilaterally along the nerves. After herpes zoster heals, the skin alone heals, sometimes causing mild or severe damage to the subcutaneous nerves. If the damage is mild, it will be accompanied by an itching sensation. Severe nerve damage can be accompanied by pain. The itching that follows the healing of shingles will gradually subside in about 21-30 days. If it is still itchy for more than a month, it is because the nerve is slow to repair. You can take vitamin B1 and methylcobalamin tablets orally to nourish the nerve. Take care not to exert yourself and not to stay up late.