Petechial rash

Good day mga mommy. Meron po bang same experience dito? My baby is now 5 months old. Since March 6 we noticed some rash on her forehead and both legs. We went to the Doctor and she did blood test. Her platele was normal and the rest of the other tests. However after the blood extraction, petechial rash also appear on her arm. Fastforward, today the pinpoint rash is all over her face now. The one on her arms and legs started to slowly fading. But the rash on her face like comes and go. Does anyone have the same experience with their los? Thank you.#pleasehelp