How do you get rid of bat wings on upper arms?

I'm young and I've lost about 25 pounds of the 50 lbs I gained. Both the gain and loss were pretty rapid. I do weight lifting and pilates and yoga. Thankfully my whole body is toning up nicely. I've noticed that my upper arms (triceps) area flabby and it looks like there's loose skin. I honestly can't tell if it's loose skin or just more fat. I'm still overweight compared to my usual self. The flabby arms are not flattering. How can I address this??