Acne vulgais(pimples) can happen in face ,chest &back where the more number of sebaceous glands are present, its due to physiological response to circulating androgen,individual response to this will be different depends on the hereditary.If its not treated properly in required time it can leave the black spots and scars.Depending on the grade of the acne we can treat both the acne & its complication.
Next Steps
consult a near by dermatologist for furyher treatment & evaluation.