Could my 4 yr old have chick pox had nasty cold cough fever 39.85 very drowsy for 2 days and has 3 spots behind his right ear and one bigger on chest?

Maybe,maybe not. Chickenpox is seldom seen with high fever but it happens & the average kid will have 50-200 spots in different stages within 3 days of eruption.Emergence on the neck is common. The best way to be sure is to have someone examine the kid.