I was going over a published study that shows acne being a result of western environmental factors of people ages (15-25).
But, does this cover the type of acne that most teens during puberty get? And then an adult grows out of?
Do indigenous people living away from civilization acquire this acne when they go through puberty? is "hormonal acne" normal?

I was also wondering about those common illnesses most children experience such as chicken pox, varicella, measles, etc. Do indigenous cultures experience this as well?