Respected doctor, i suffer from acne vulgaris & usually they do resolves on its own after few days but the issue is that they leave black mark on my skin. what can i apply to have them heal or remove that from skin? it's very depressing to see marks?

The best treatment for acne is prevention. Daily wash your face in the morning and at night with a good quality face soap. This will clean out your pores and reduce the number of bacteria on your skin. Following this, apply a medicated acne preparation containing either benzoyl peroxide or salicylic acid. These also reduce bacteria and open clogged pores. Lastly, treat pimples with spot treatments

Go to a skin doctor[dermatologist] for the proper medication. Don't try any home remedies, you could cause more problems.