I’m sure you already know, you cannot target one area for fat loss, unfortunately. You gain fat in the areas you are genetically predisposed to gain fat. Two people with the same weight, height & body fat % can have entirely different bodies & trouble zones..it’s genetics.
BUT…You can still lose that fat in your trouble zones, it’s just that the trouble zones will likely be the last area to shrink. It takes proper nutrition (including food types, portions, frequency & the necessary nutrients), cardio, sleep, water, stress relief, and STRENGTH TRAINING your entire body.
But, that said, gaining muscle in those areas DOES help the appearance of those areas. Muscle DOES increase your fat burning metabolism (the more muscle, the higher the metabolism), & muscle does give you your body its BEST shape.. among COUNTLESS other benefits.