my son 19mths old. 15days ago he had high fever went to doctor paracetamol for every 4hrs prescribed but in the evening he got rashes type all over the body. we went there itself and doctor said it's a viral infection, it'll go automatically and gave lotion to apply. in 2 days he'll become normal. 4days ago suddenly rashes seen and temperature goes from 99 ,101 ,103 went to doc said same viral. next day he recovered fully after paracetamol oral intake and rashes gone. today again body temperature starts to raise. what will be the cause ?