My friend neck has a red big red boil on a private part what should he do
If your friend has a red bump on their private area, it would be a good idea to get it checked out by a doctor even if you think that it is a boil. The doctor would know best on how to treat it.
Take him to a doctor
Go to the doctor
First off. How do u know? But take him to a medic
Don't touch it