I am not a paediatrician, however my concern is that she has an inflammatory response possibly due to a bacterial infection.
I would like her to see her doctor today. If the blotches do not go pale when pressed with a glass, I would like you to take her to the ER straight away.
Without seeing the blotches, it is impossible to have a clear diagnosis however heat and swelling in a joint with a rash need investigating.
Children do have faster heart rate than adults, however a racing heart could again indicate an infection.
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