Acne myths.  1 Acne is caused by a poor diet.  2 Acne is caused by having dirty skin and poor hygiene.  3 Squeezing blackheads, whiteheads and spots is the best way to get rid of acne.  4 Sexual activity can influence acne.  5 Sunbathing, sunbeds and sunlamps help improve the symptoms of acne.  6 Acne is infectious.