trądzik młodzieńczy po angielsku:

get a rash or pimples

Eating too much chocolate will give you pimples.

You've learned the hard way that picking pimples can leave small scars or even big crater-like ones

I knew him when he was just a spotty youth.

a spotty bow

She felt uncomfortable because of her spotty face.

He's ugly, because he's spotty.

It could go spotty yellow and green.