Why is it that people in 20th century london and in the medieval eras never portrade with ance
There's always room for more responses and discussion, but I'd recommend checking out a few similar questions from this subreddit:
Was acne so widespread in the past as it is today?
Did people have bad skin as often as they do now before this century?
That's more of a matter of theatrical portrayal, than anything else. There was obviously acne in the past.
For example Maria Bárbara Xavier Francisca Leonor wife of Spain's Ferdinand the VI was notoriously ridden with pimples and acne scars, we know this from a 1758 relay of their wedding