Hi, my three year old suddenly came over to me after being perfectly fine all day and just couldnt keep her eyes open, and then within an hour she said her tummy hurt. She did have about a 100 temp and then got very hot to the touch, red and hives. This all was from 7-11 tonight.
The common cause of fever with red rash in this age group is some viral infection. Other less common cause may be allergic dermatitis or blood disorder(platelet deficiency). Give her Paracetamol(don't use NSAIDs until advice). Consult your pediatrician for proper clinical examination with investigations and management accordingly. Regards