A sebaceous cyst is also known as an epidermoid cyst. Basically, it’s a bump that starts to shape the bottom of the skin. This type of cyst occurs when the sebaceous glands become blocked by keratin proteins. One of the easiest Herbal Supplement for Sebaceous Cyst is apple cider vinegar. This treatment is prepared with acetic acid. It is able to slaughter off bacteria while treating acid cysts.