light-skinned palms
When the palms of a character are depicted with a lighter tone than their skin color, it is commonly observed in characters with very dark skin, dark skin, and even colored skin. Do not tag when the difference in tone is not clear or prominent in the image, and if the palms are shaded brighter due to lighting conditions.
Examples
On light skin: Danbooru post #6472963
On dark skin: Danbooru post #6553321