One of the main causes of backne is residue from hair products. It can cause a lot of damage to the skin resulting in breakouts. To avoid this, after shampoo and conditioning, bunch up your hair in a bun away from your back. Soap your back gently to remove any kind of residue. Wash off with warm water. Use an oil-free acne wash for best results. Treat rinsing as your first and the most important step to a good back skin care routine.