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(266) A haematoma is a pocket of blood that forms beneath the skin or in muscle tissue and is associated with a ruptured blood vessel. It usually arises from trauma particularly over the shoulders, flanks or the hind quarters. Not uncommonly the ear of the sow may be damaged following fighting or head shaking and rubbing associated with mange. Once sufficient pressure has built up in the tissues the haemorrhage stops and a clot is formed which is gradually removed by the normal body repair mechanisms and the swelling disappears.

In some cases the haematoma may be infected and an abscess will develop. This should be dealt with has described under abscess. It is inadvisable in the sow to lance a haematoma if it has not developed into an abscess. Always sample the fluid first by syringe and needle. If blood is withdrawn the haematoma is of recent origin and if serum is present it is long standing. Leave both alone. Animals with large haematoma of the ear are best culled.

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