Teenagers can use it externally.
Method: Wash your face with clean water before applying it. /kloc-wash with warm water after 0/5 minutes. (Don't use cleaning products such as facial cleanser) Otherwise it will be very irritating to the skin.
Two methods to remove acne marks:
Wipe your face with eggplant skin.
Wash your face with a little white vinegar.
It needs long-term persistence, but it has no side effects.