I'm not sure what these were, although their disappearance doesn't set off any warning bells in my head. Moles and freckles do not necessarily come where the sun shines. Moles generally do not go away by themselves, so I assume these are some sort of freckle. I suggest you have a skin doctor look at them before they disappear altogether, but I don't think you need to worry.
Take care.
Dr. Rockoff