In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.
A region of injured tissue or skin in which blood capillaries have been ruptured; a bruise.

* Contusion is the medical term for a bruise, where blood capillaries underneath the skin are ruptured due to an injury.
Pustule is a small blister or pimple on the skin containing pus.

Knurl is a small projecting knob or ridge.

Tumour is a swelling of a part of the body caused by an abnormal growth of tissue.