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Fever with bodyache and rash has a list of causes and hence the diseases that can produce this complex is very broad and for that reason you should get examined by a local physician and get investigated.
First proper diagnosis is to be settled and then comes the treatment.
There are many possibilities, some quite serious so review early to avoid complications.
Probable illnesses are dengue
, typhoid fever
, Q fever
, sometimes non-infectious diseases like acute myeloid leukemias, TTP etc can also cause this syndrome.
I hope the advise would be informative and useful for you.