it would have been nice if you have posted your rash. normal viral fever can also cause erythematous rash all over the body. if its pin pointing rash we can consider dengue fever.
from the reports you have sent, your
CRP is high and your Platelets levels are on lower normal range. get your Dengue Ns1, Ig G/IgM done to rule out dengue.
Fever with loose motions (diarrhea) and a rash can signal several conditions like viral infections, typhoid fever, or allergic reactions. Because a rash combined with a fever needs careful checking, you should contact a doctor right away for a safe diagnosis.
Next Steps
feel free to consult me on practo for further evaluation and personalized management