Need advice: bites but no evidence found yet
About 10 days ago my daughter woke up with several bites on her body, but since they wet spread out we figured it might be a spider or a mosquito. The following few days, however, she woke up with a few new bites, some in a line on her face. In total there was probably less than 10 after 4 days. I removed all her sheets and washed what I could, and ran all the rest and her stuffed animals, and everything else on high heat in the dryer. Checked for anything on mattress or bed frame and pillows and found nothing. The only evidence I’ve ever found are about 3 really small red dots on her pillow case but I’m not sure if the stains were there before the bites showed up or not.
I thought everything might’ve been ok but she again got a couple bites. So I dismantled her bed, looked in every screw hole, and also looked at the furniture (turned them upside down) and checked in all the seams and have not found any evidence, like molted skin or eggs or black or colored dots of any kind on the wood or furniture. I looked in the foam mattress and nothing. She has for the last four days slept with us, and at first nothing showed up. We also took her to a doctor and said that it is a bite but he wasn’t sure. Two more bites showed up isolated, one by her eye and one on her back shoulder. I looked at our sheets and found one black dot, and touched it but it didn’t smear. All the sheets are in dryer now and I’ve turned over bed frame and our foam mattress and still no evidence. No dots or blemishes or molted skin etc. there aren’t any blood stains either on the sheets etc. I have also vacuumed at every step of my search but did not use a steamer or hair dryer in my investigation.
I’m really not sure what to do now since she is still recieving bites I wonder if they are delayed reactions? My wife and I have not gotten bites but again I can’t find any evidence that I can show an exterminator if I call one.
Any advice on next steps would be greatly appreciated. Thanks!