extravasation

When extravasation has already taken place, massage is the most speedy and efficacious means of dispersing the effused blood.

There was extravasation into and beneath the periosteum, and subsequent destruction of the continuity of the bone.

Wounds through the breast, the abdomen, the heart—all clean cut punctures, and yet no gore—no extravasation!

An extravasation of blood or slight hemorrhage under the skin resulting in a purplish patch.