hi, thank for consulting HCM Acute, sudden onset diarrhea occurring together with skin symptoms, like itch, tingling, swelling or rash may be caused by: Childhood viral infections, like measles, scarlatina, rubella, chicken pox, infectious mononucleosis.The most common one is the varicella virus, which causes chickenpox. This rash starts as flat red bumps that then become crusted over. They usually start on the face and abdomen or back and then spread to the whole body. Other common viruses that cause rashes have become less common because of vaccination. These include measles and rubella or german measles. Bacterial infections can also cause rashes throughout the body.So as it is before the bee sting consult a pediarician for further advice.THANK YOU.