A petechia (/pɨˈtiːkiːə/; plural petechiae /pɨˈtiːkiːaɪ/) is a small (1 - 2 mm) red or purple spot on the body, caused by a minor hemorrhage (broken capillary blood vessels).(Wikapedia)
I get this sometimes on my arms. My local Ehlers-Danlos specialist said that she has seen this in other patients with hyper-mobile EDS. She points out that it is not likely to be systemic because it is limited to my forearms. It is probably related to overuse of my arms from so much computer work.
(c) Susan B Spitzer, PhD 2019