My 21 month old has a bright red rash with \"C\" shaped spots on his trunk, extremities and neck.  He has no fever, but has had diarrhea for 3 days.  He vomited 3 days ago once, then again yesterday once.  Should I be concerned about the rash?  He seems fine, except a little tired.  He is still playing normally.
Hi...looks like a toxic urticaria or a sort skin allergy. It may or may not be related to the diarrhea. But as you say the kid is playing normally I can say that you can be rest assured. But, skin conditions are best diagnosed only after seeing directly. I suggest you to upload photographs of the same on this website, so that I can guide you scientifically. Hope my answer was helpful for you.  I am happy to help any time. Further clarifications and consultations on Chat Doctor are welcome. If you do not have any clarifications, you can close the discussion and rate the answer. Wish your kid good health.