Maskne!

I would like to know this too my skin has gone awful I thought it was hormones. Never in my life have I suffered with boils or acne

This may be worth a read - Stylist tend to be really up to date with current skin problems.

https://www.stylist.co.uk/beauty/acne-spots-from-face-mask-maskne-how-to-avoid-blemishes/398526

The ordinary, niacimide.

Or make garlic paste put a little bit on the pimples they will dry.

Spots are usually because of excess oil clogging the pores and wearing a mask stops your skin from being able to breath, so more spots appear. You can try the seaweed range from the body shop. It's based around oil control which should stop the spots from forming as much. You can also try wearing an oxygen foundation which will help your skin to breath more and reduce the clogging of pores. Spots on the chin are also made worse around women's menstrual cycle, it's the section most targeted on a women's face during changes of hormones. There are some people who use different creams during their cycle. Try to avoid applying anything too heavy in the effected area such as thick creams and full coverage foundation as it will make it worse. And avoid oil based concealers

Superdrug do a tee trea spot stick which is really good! Highly recommend that!

I ended up with really bad boils and had to go to doctors for meds. Its worth trying a few products from boots or superdrug first. If it gets any worse go doctors.