For scar removal, following options are available for you:

Prescription creams, ointments, or gels: They are effective for scars that are caused by cuts, injuries or wounds. Often times, treatments can include steroids or certain oral antihistamines for scars which particularly cause itching and are sensitive. And, if your scars are a result of acne, then consult dermatologist for advice. Additionally, your doctor can also recommend pressure treatment and/or silicone gel sheeting to either treat scars or use prevent them from appearing on your skin in future.

Surgical treatments: This involves a wide array of procedures such as skin grafts (limited to treatment of burns), excision, dermabrasion, or laser surgery

Injections: For scars which stick out, you can have steroid injections, they are effective for keloids or hypertrophic scars. Other types of injections, such as collagen and "fillers," may work on pitted scarring as well, but these solutions are usually not permanent.
For whiteheads you will mostly be suggested lifestyle fixes along with medical prescriptions & skin care products, whereas for pimples too you can expect the same, but additionally chemical peels, microdermabrasion, and laser therapies too.
For the convenience of our users, we have also made the list of Skin Treatment doctors in Mumbai available to them, let us know if you reside in a different city. Also, you can drop us a message anytime you need more guidance or help related to medical issues!