A picture as they say is worth a thousand words.
In this case, three pictures.
The images below are cropped from SL skin textures; neither has been altered except for cropping, resizing, and adding a circle to point out the salient features of interest. The Hush skin texture is representative of her skins for sale in SL; they all carry the same identifying mark. How I got the textures, I won’t share; there are ways, it’s not relevant to the point of this, though.