what is the difference between a cyst and tumor?
Difference between Tumor and Cyst. Key difference: Tumors are unnatural lumps or growth formed by extra cells in the body. A tumor can be benign (not cancerous), pre-malignant (pre-cancerous), or malignant (cancerous). A cyst, on the other hand, is a common skin condition that occurs among people. A cyst is a closed capsule or sac-like structure.