I've been having outbreaks of what my gp says is petechiae on my arms, chest, thighs, back and hairline. Had a cbc which was normal, but they keep coming back. Gp is referring me to a dermatologist. Only other symptom is bad night sweats. I have high bp controlled by meds and reflux controlled by meds. Any ideas what could cause petechiae with a normal cbc? Also wondering what to expect at the dermatologist, ive never seen one before.