I hit my leg the other day. now there is a bump and its tender. no bruise tho. did i damage the thigh muscle?

Hematoma: A hematoma is a collection of blood, usually clotted, outside of a blood vessel that may occur because of an injury to the wall of a blood vessel allowing blood to leak out into tissues where it does not belong. Sometimes your will see a bruise, other times not. Most hematomas can be treated with rest, ice, compression, and elevation (rice). They will gradually resolve over time on their own.