How to lose stomach fat without gaining muscles?

What exercises should i do to lose stomach fat and other body fats without gaining muscles? I want to gain muscles but after i lose most of my body fat , i am not fat at all but i just have this little lump at the lower of my belly that i cant get rid of i tried pull ups for months and i gained abs without this fat disappearing so what can i do to remove it, and i dont want to alter my nutrition i just want to keep it in the exercises.