Puppy licking and nipping on paws a lot

Hi, my now 5 month old puppy has been licking and nipping on his paws basically since I got him at 8 weeks old, the vet gave a shampoo, I think it’s gotten a bit better (feels like he doesn’t do it as often or just what I think) but he still does it. Now he was licking really intense so I checked his paws with a flashlight and his fur between the foot pads are of almost pinkish color as seen on the picture, though the color is almost only seen with a flash light which also is seen on the other 2 pictures. Anyone know if this is normal or something that needs to be checked again?