S.H.
How do you know it is "acne?"
I would check with the Doctor and make sure, first.
It could be anything.
Just don't put things on it without knowing full well what it is. And certainly do NOT try to "pop" it or open it or abrade it.
My son, has on his left cheek an accumulation of skin cells...it is a kind of birthmark. He was born with it however. But, out of protocol, our Pediatrician had us see a Pediatric Dermatologist, to rule out anything else, and to keep an eye on it. Once a year, we have to have it checked.
To the layperson, it looks like "acne." But it is not.
So with this in mind, I would really ask your Doctor and have him/her look at it closely... with a magnifier even.
Or it could just be a clogged pore.
But have it checked.
All the best,
Susan