Multisystem inflammatory syndrome in children can occur approximately 2-6 weeks after a severe COVID-19 viral infection and is not contagious. In this rare and potentially life-threatening condition, different parts of the body can become inflamed because the immune system goes into overdrive. Some of the symptoms include fever, rash, red and cracked lips, big lymph nodes, abdominal pain, vomiting, diarrhea, bloodshot eyes, a red tongue that looks like a strawberry and feeling very tired.