What is a cyst?

What does a cyst look like?
A cyst appears softer to the touch than a tumor. (1)

What does a cyst do?
A cyst and and tumor can look similar. (1)

Where are cysts located?
A cyst can form on almost any part of he body. (1)

What does a cyst contain?
Cysts are sacs containing other substances, such as fluid or air. (1)

1. https://www.medicalnewstoday.com/articles/249141#types