Hello, Herpes Zoster can be a very painful condition. If you let me know your dad s medicines, I could suggest some that would bring him relief. It is normally not dangerous unless your father is immuno-compromised due to other diseases. It can infect people who have not had chicken pox through very close contact. We do not normally isolate people. Some people advice honey, neem, coriander etc. Being a viral disease, in most cases it will get cured with or without home remedies, but there are modern medicines like Acyclovir which can accelerate the healing. You are welcome to contact me if you have any further queries. Dr. Noble Zachariah