Signs and Symptoms
- Hematomas can be visible under the skin or felt as masses or lumps
- Lumps may be caused by blood being limited to a specific space
- Hematomas may dissolve or continue to grow
- Broken down blood cells and hemoglobin can move in the connective tissue
- Hematomas on articulations can reduce mobility and resemble fractures

Classification
- Hematomas can be classified based on their location and cause
- Types of hematomas include subdermal, intramuscular, and skull/brain hematomas
- Subgaleal hematoma occurs between the galea aponeurosis and periosteum
- Cephalohematoma is commonly caused by vacuum or vertex delivery
- Hemangioma is a misdiagnosis of a hematoma in the vertebra

Types
- Subdermal hematoma occurs under the skin
- Intramuscular hematoma develops inside muscle tissue
- Skull/brain hematomas include subgaleal and cephalohematoma
- Hematoma can also refer to a mass or tumor
- Hematomas can occur in various parts of the body, such as the ankle or buttocks

See also
- Metanephric dysplastic hematoma of the sacral region
- Welts can sometimes resemble hematomas
- Further information on hematoma types, causes, and treatments
- Hematoma information from the University of Utah library
- Robbins Basic Pathology textbook reference

References
- Hematoma classification according to ICD-10 and ICD-9-CM codes
- Definition of hematoma from the Online Etymology Dictionary
- Reference to a book on pathology discussing hematoma
- Additional reference from Emedicinehealth.com on hematoma information
- Gross image of a hematoma on a toenail from the University of Utah library