Greetings. Pimples may often leave spots especially if not treated or if we burst pimples or pick them. YOU DONT NEED A MOISTURISER IF U HAVE OILY SKIN / AND U CAN USE A SALICYLIC ACID BASED FACE WASH LIKE SPONGYSAL OR SASLIC. You'll need skin lightening creams for a specified duration 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. If u have 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.