<s>[INST] Hi, I had an itch on my arm, and scratched it a little, normally a rash would develop,but this time, little red spots(lots of them) appeared, 2 days back I had the same thing occur on my thigh.I'm worried that it is petechiae, or I'm just being paranoid because it could be a sign of thrombocytopenia, and I'm kinda worried. Should I go get it checked out? [/INST] Dear patient!Welcome to HCM!Itching may be caused by many medical conditions of skin or other organs symptoms of whom are showed on the skin. Many of them may be associated with blood analysis alterations. Just make a complete blood count at first, and then go for an appointment with the dermatologist.Kind regards!Dr Eriol. </s>