Black heads can be removed in one session (painlessly) with an instrument called comedone extractor. You develop pimple marks if you tend to touch or pick your pimples,so avoid that.You need to get yourself examined by qualified dermatologist for the type of skin you have and also type and severity of acne based in which you will be prescribed medicines that will suit you the best.Hope this information helps.Regards, Dr. Jeetendra Khatuja (ASKA AESTHETIC CLINIC, MUMBAI)