Thanks to HCM I can understand your problem flu is maily caused by virus.it may cause fever ,congestion and generalized weakness some viruses cause red bumps like chickenpox,measles here we have to take antivirals along with antibiotics to prevent severity and secondary infection. you have to use antiallergic drugs like levocetrigine to prevent itching so I would like to ask you just do CBP.ESR. to rule out the disease avoid overcrowded places,exposure to cold and dusty areas don t worry ,it may subside itself slowly plenty of liquids you need here . if high grade fever is there have cold sponging with cotton or soft cloth. use calamine lotion on itching area for soothing effect .ok