Hi. Greetings. Pimples may often leave spots especially if not treated or if we burst pimples or pick them. Lacto calamine has no therapeutic effect for marks. Melacare will reduce spots but should not be used for long. You'll need skin lightening creams for a specified duration by the dermatologist to reduce the marks , and this could also be dealt with chemical peeling. Also you must use a sunscreen to prevent darkening of the spots. For scars, creams may not work n you may need procedures like microneedling, microneedling rf, fractional lasers, prp or subscision or a combination of these. Send in your pictures if you need further assistance. Or see a dermatologist near you and discuss the same with him. Hope this helps. Warm regards.