It happens. But it’s not always something to be alarmed of.
Back acne is often the result of an accumulation of dead skin cells and oil [sebum] within the pores in the skin, combined with an overgrowth of a common skin bacteria, Cutibacterium acnes, which triggers an inflammatory response.
Hack it with a tea tree oil.
All you need is to apply Tea Tree oil on your back for 1-2 nights in a row. Tea tree oil is powerful anti-bacterial and anti-inflammatory oil. Usually back acne will disappear right away. And then you can just do it whenever it is needed again.
But in general, don’t forget to scrub and exfoliate your back too when taking the shower. This will help prevent the outbreak in the first place.