If this occurs, think about everything that comes into contact with your skin. A big culprit can be cosmetics. Both sexes can also get acne on their necks from perfumes, colognes or a new cleanser or fabric softener used on collars. Ask yourself whether you have recently changed hair products - especially if the acne is where your hair touches your face or on the side of the face on which you sleep. If you have changed your diet, realize it is not a myth that what you eat can affect your skin.
Susceptibility is individual.
Maybe just peanuts or cashews or potato chips caused your acne if you recently began eating more. An over-dose of rich cheese or even yogurt can give some people acne. If you began taking oral contraceptives or hormone replacements, you should discuss this with your dermatologist. Light exfoliation with special sponges or loofahs and use of masks containing ingredients mentioned above may also help. My skin has become dry and very itchy recently, especially on my legs and arms as well as on my body.