Sorry to hear about your little child, it must be difficult being far from home.
To confirm firstly if fever and cold is definitely ongoing for over 5days? If so, it is good to get medical review as most viral illness fever should max subside by day 4-5.
Has your child had chickenpox or the vaccine for it? If the rash is all over and itchy it could be that. Some soothing cream/gel specific for chickenpox could help. Try lactocalamine which is available more readily everywhere.
Next Steps
Control fever
Maintain good hydration
Health Tips
If child has had fever >5days or is lethargic even when fever is less than 99.5F seek early medical review