Laura, they're like little bruises, areas where your blood vessels were leaking into the skin, and they mean you were *really* sick, almost to the point of DIC (disseminated intravascular coagulation, which usually means blood transfusions because your platelets are getting so smashed up by the disease that oxygen isn't reliably getting to your brain any more.)
I assume they will go away -- bruises go away. I didn't have them, but I'm sure someone else with Class I HELLP has had them, so you could try searching on "petechiae" in the search engine, or just waiting for someone with a more similar history to chime in.
(Jen, you just made. my. week. Thank you!)