My thirteen year old special needs daughter had a petechial rash on her right arm last week. She did not have a fever, she did have a slight cough that was later on in the week diagnosed as asthma. The rash was on the underside of her forearm and was only at the most ten dots. I noticed it on Wed. evening, it was light pink in color and did not blanch. I have no clue how long it had been there. I took her into the ped. on Thursday morning and he ran a qbc in the office, I think her platelets were 194,000 which are well within range. Her hemoglobin was on the high end of normal and lymphocytes were 32%.Everything was in normal range. By Friday you could hardly see the pink spots and by the weekend they were completely gone. My question is , is there a concern with such a localized incident? I cannot recall her getting hurt or anyhting, the only thing i can think of is she sleeps on her arms. If it were something serious wouldn't more have showed up by now?