I am very pleased that you are concious about acne problem. Most of the things you are doing are correct. yea lacto calamine does reduce acne and acne scars but sometimes, it may block the skin pores. I would repeat the preventive measures.
Keep your face a little dry, as oiliness is one of the major causes of pimples.But don't over dry as it again can block the pores.Wash your face with a normal soap every morning and evening.Use soap mainly on the upper half of the face,more precisely on the T-zone,which is on the forehead,nose and naso-labial folds.Do not use it excessively.
Avoid/reduce all oily creams,sunblocks,cosmetics and hair oils.Do not squeeze pimples which usually causes inflammation and later leaves scars.Let them dry gradually,it will take some time though.Its normal that during winter skin gets dry.So apply a moisturising lotion just on the dry spots.
Acne scars will get better with time.Topical retinoids can help in the scar healing.There seems to be no evidebce that taking steam helps acne. For light scarring Laser skin resurfacing is the most acceptable methods. For more deeper scars, chemical peel, dermabrasion, ablative laser CO2 resurfacing may be the better option.necessary. Several options like surgical excision and other are also available.