Hello ... we call this as truncal acne where the eruptions are seen over the Back , shoulders and upper chest.. They are notorious in leaving marks and scars ... the root cause is harmonal and to add are few triggering factors like diet, stress, lifestyle etc...treatment varies from simple topical agents to procedures as mono therapy or in combination for giving good results
Next Steps
Consultation with a qualified dermatologist for better understanding and appropriate treatment
Health Tips
Avoid oily and junk food
Avoid stress
Further consultation with dermatologist online by sharing pictures if comfortable to achieve desired results