petechia

noun

1. A small spot, especially on an organ, caused by bleeding underneath the skin.

   “It is scurvy. All my authorities agree – weakness, diffused muscular pain, petechia, tender gums, ill breath – and M’Alister has no doubt of it.”

   “The marks on Jane's skin were petechiae, little hemorrhages that indicate lack of platelets in the blood. She needed two units of platelets transfused into her bloodstream.”