A small blister slightly outside the vaginal opening - what is the cause?

Patient's question:

Menstruation often occurs before

Doctor's answer:

Generally speaking, for healthy individuals, it is sufficient to use clean warm water for washing daily. For sub-healthy individuals, due to factors such as life pressure that can lead to a weakened immune system, they may choose to use care liquid products to maintain their own defense system. As for non-healthy individuals, while undergoing medical treatment, it is best not to use health care and care products.