Patient Information Leaflets (PILs)
These Patient Information Leaflets (PILs) are specially written by the British Association of Dermatologists (BAD).
The BAD has been awarded The Information Standard certification for the process it employs to develop information products aimed at the general public, which include PILs, Sun Awareness Campaign materials, and other information products.
The BAD shall hold responsibility for the accuracy of the information published, and neither the scheme operator nor the scheme owner shall have any responsibility for costs, losses, or direct or indirect damages or costs arising from inaccuracy of information or omissions in information published on the website on behalf of the BAD.
Cysts - epidermoid and pilar
By definition, cysts are closed sacs that have two main features:
Contents that are liquid or semi-solid
The lining. Differences between the lining of epidermoid and pilar cysts can be seen under the microscope:
The lining of an epidermoid cyst looks like the epidermis (the outermost layer of cells in the skin)
The lining of a pilar cyst is made up of cells like those found in the roots of hairs
The contents. Both types of cyst contain a cheesy material, looking rather like toothpaste. This is made of soggy keratin - the material that makes up hair and the outer layer of the skin.