I have posted how magnesium + calcium + d3 + zinc had cured my acne in the nutrition holistic forum. (Specifically magnesium + calcium because I have been on D3 and zinc for a while and it never really made a difference. Well, vitamin D3 helped temporarily and minorly and it never helped for my back acne).
But just in case you guys do not go there (I know that sometimes I avoided that forum because despite eating a healthy diet, my face and back were a wreck and it was frustrating). So I am posting here.
Magnesium cleared my BACK acne. I had cysts and pus filled ones. It affected my whole back and shoulders. Please consider taking it... magnesium is important if you have too much calcium in your diet. Magnesium is also needed for PROPER calcium absorption. Plus, many people are lacking in magnesium. I tried magnesium oil but that never worked for me. I had results from taking it internally in an absorbable powder form (natural calm plus calcium).
I don't wash my back with any soaps or nothing. Just let the water hit my back when I shower. That is all. I don't even have to think or worry about it.