Here are a few tips that can help to prevent acne on shoulders and upper back.
acne] Has anyone had these little red zits on their back
How to Get Rid of Shoulder Acne Fast?
Chest Acne: 8 Ways to Get Rid of It
How to Get Rid of Back Acne Scars: Lighten and Heal
Shoulder Acne Explained: Why It Occurs & How To Treat
Acne] No matter what I do I still have shoulder, chest and back acne : r/SkincareAddiction
How To Get Rid Of Chest Acne From Home Quickly
How to get rid of pimples on my back, chest and shoulder - Quora
Shoulder Acne Causes, Home Remedies, and Medical Treatments