Hi, Thanks for posting your query. With the available described details, there appears to high possibility of Acute viral gastroenteritis. Rash may or may not appear with any sort of viral infection. All viral infections are self limiting in nature and persist for at least 3-5 days. Rash also subsides after control of viral infection. You should consult with internal medicine specialist/ gastroenterologist and should go for thorough check up. You should go for complete blood count, erythrocyte sedimentation rate, ultrasound imaging, and serum electrolytes, renal function test. You should take complete antibiotic therapy, antispasmodics, probiotics, antipyretics, if needed. If itching is present in rash then you should also take anti-allergic medications. You should maintain your hydration status by taking potassium rich liquids. Take soft diet along with yogurt and banana. Avoid milk and all milk related products. Take care, Dr. Mayank Bhargava