What is the difference between Hematoma and Tumor?

The difference between hematoma and tumor is that "hematoma" is a swelling of blood, usually clotted, which forms as a result of broken blood vessels and "tumor" is an abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.

What is the difference between Nevus and Hematoma?

The difference between nevus and hematoma is that "nevus" is any of a number of different, usually benign, pigmented, raised or otherwise abnormal lesions of the skin and "hematoma" is a swelling of blood, usually clotted, which forms as a result of broken blood vessels.