BACKGROUND: Vellus hair cyst is an uncommon developmental abnormality of the vellus follicle histologically defined as a stratified squamous epithelial-lined cyst containing one or more vellus ...

The left side of his face got this way due to sun exposure, what those dermatologists who read NEJM call dermatoheliosis, a "thickening and wrinkling of the skin." This picture of a 69-year-old ...