The term COMMON CYST can be solved in a crossword puzzle with the answer WEN, which is a three-letter word. A WEN is a type of cyst that is commonly found on the skin. It is usually benign and filled with keratin, a protein found in hair and nails. They can range in size from very small to large and can be found anywhere on the body. Treatment is usually not necessary, but they can be removed if desired.