Holy Saint Bartholomew, . . . . . . . . . . . . . Catholic saint for skin, dermatology and physical healing . . .

. . . this really works

Red onions marinated ( for a day or two) in apple cider vinegar. 

Dip washcloth, wipe face, neck, shoulder, even below the beltline.

The smell is something you have to accept. The skin treatment should be done some time before showering.  I also do it before bedtime.

I noticed quicker healing of popped zits, no new zits in treated areas.  No mosquito bites.

If you leave the jar open in the kitchen, mosquitoes and bugs  keep their distance.

There's plenty of health benefits to not just consume onions and vinegar, plenty of benefits when used on the skin and hair

Onion on Skin: Potential Benefits and How to Use  healthline