To cure any kind of acne in 2 weeks:
50/50 mix of water and organic apple cider vinegar
50/50 mix of water and tea tree oil
apply the apple cider vinegar mix to area with acne, and let it dry
then, apply the tea tree oil mix and let it stay on the skin overnight
using a loofah or washcloth to remove dead skin and excess oil from the area is recommended, especially if it is the back or chest. if your skin is very sensitive, then don't scrub it. the acid from the vinegar helps in removing the excess oil/skin buildup anyway!
this will cure most any acne within 2 weeks if you are consistent with applying it before bed each night. i had severe cystic acne and it was gone within a little over a week!