What  do  these cysts look like?

They  are round,  sometimes  dome-shaped bumps,  lying  just  under the skin surface. Some are yellow  or  whitish.  A  small  dark  plug  is  often present,  through which it  may be possible  to squeeze out  some  of  the cyst’s  contents.

The  cysts  range in size  from those  that  are  smaller  than  a pea  to those  that  are several  centimeters  across.   They  can occur  anywhere on  the skin,  but:

Pilar  cysts  are  most  common  on  the  scalp,  where several  can often  be  found. Epidermoid cysts  are  most  common  on  the  face,  neck,  genital  skin  and upper trunk.