Hello Dr.,last Monday My Grandson Developed A Purple Chin This

Hello Dr.,last Monday my grandson developed a purple chin this after having some issues with vomiting here and there. I took him to ER and they insisted he sucked the air from a cup and made a mark. However after 4hrs. Bloodworm was ordered and we were sent home on a note of everything was fine. Although I did present to them he had had a fever rash vomiting trouble with bowels. I followed up with ped. The next day same diagnosis from that office everything's fine. Later that night my 12 yr. Old developed pain under left ear,an issue we had about 1yr. Ago with redness and swelling,we were given steroid and antibiotic at that time. Again I took the child to led. And he was prescribed cephlaxin and it took the pain away and by Friday follow up call he had disappearing chin rash,we were also given zofran for vomiting on Wednesday as every time it ate he vomited. Today was his first day returning to school since the 27th and this evening he has the purple chin reappearing with headache and abdominal pain accompanying. I have called his led. Dr. At her after hour # but she has not returned the call. I will follow-up once again with her in the morning. I hope she considers HSP syndrome as I already suggested its possibility on the 28th visit. I had suggested platelets to ER on the 27th. Given we were sent to commission about a year ago for follow up of unusual bowel habits I believe there is muchmore going on here than a child sucking air from a cup,I might have believed it myself if I had not been with this child the whole time and he did not do this childish act,in fact he is disappointed they have not believed him when they asked if he had. I was hoping his led. Dr. Would have returned the called as I had left message as to whether or not she thought I should take this child back to the ER again tonight. I'm grandma with custody of three. Busy day tomorrow already. Any info you may have Dr. Andrew (if I may call you that) is much appreciated. Thankyou Sandra B.