Thin skins lose pixels

Over the last months, I had an issue with my skin. Some pixels from my top left and right hand can be found in my hand. I tried changing my skin from thin to normal to see if it also occurred there. It didn't my skin was just as I designed it. I do not know if this is a feature of thin skins but if it isn't it must be a bug.

Thank you for taking the time to read this.