Hi, my son age 12 has just developed chicken pox from head to toe. He has been prescribed antibiotics for this and also been given a oil for the bath and cream for his body. He has also been given a coldsore cream to apply to his penis. He is not circumcised. He has no difficulty peeing and is not in any pain. Yesterday the was 1 big white blister under the foreskin, today there are also lots of small white blisters, this has developed overnight. Is it ok to use the coldsore cream under the fore skin?