Minecraft Skin Problem

So I've yesterday got Minecraft, and I've made some skins, which today I decided to choose one, which has an problem.
On my Minecraft Skin I've got an white dot, which isn't something from the texture, and not the hat either, I checked on NameMC so I can see if it also is there, and it isn't. I tried to change a little thing to it but still appears.
Can anyone help?
Thank you!