You are suffering from adult onset acne which is usually continuum of adolescent acne .
It is a complex disease with multiple factors like genetics, hormones, diet, stress, medicines, smoking , endocrine diseases, cosmetics, sunlight etc contributing to it. It can occur on face, back and chest.
Multiple medicine are available for its treatment
Next Steps
consult a dermatologist with photographs for treatment.
Health Tips
avoid food with high glycemic index, avoid smoking, stress, take proper sleep.