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

Hematoma (Wikipedia)

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Not to be confused with Hemangioma.

A hematoma, also spelled haematoma, or blood suffusion is a localized bleeding outside of blood vessels, due to either disease or trauma including injury or surgery and may involve blood continuing to seep from broken capillaries. A hematoma is benign and is initially in liquid form spread among the tissues including in sacs between tissues where it may coagulate and solidify before blood is reabsorbed into blood vessels. An ecchymosis is a hematoma of the skin larger than 10 mm.

Hematoma
Other names	haematoma
Contusion (bruise), a simple form of hematoma
Specialty	Emergency medicine

They may occur among and or within many areas such as skin and other organs, connective tissues, bone, joints and muscle.

A collection of blood (or even a hemorrhage) may be aggravated by anticoagulant medication (blood thinner). Blood seepage and collection of blood may occur if heparin is given via an intramuscular route; to avoid this, heparin must be given intravenously or subcutaneously.