Hi, You said you suffer from acne vulgaris. It is a multifactorial disease. There may be different form of acne like comedones,papules,pustules or cystic lesions. After healing the lesions,you may develop black spots and scars. Stress, anxiety, sleeplessness,drugs like steroids,oil food,dandruff..etc might exacerbate the disease. I can understand your anxiety for acne and you might get post acne melanosis. But, you have to take treatment for long time to have good response. You consult dermatologist. He might give antibiotic like minocycline 50 mg daily in morning and isotretinoin cap in low dose of 5 mg daily at night . And he might advise to apply clindamycine gel in morning and adapalene gel at night. And to cleanse the face with antiseptic like acmed face wash. Have pateince for the result. It may take few months for the good result. I hope you got my answer. Thanks. Dr. Ilyas Patel MD