On the basis of your sign and symptom you are suffering from rashes due to mosquito bite.
Only on the basis of mosquito bite no one can decide the it is dengue.
As you know that best treatment will be depend on the correct diagnosis and correct dinosis depend on the complete history of the patient so take consultation from a doctor and give complete history of the patient so that correct diagnosis will be make and then best statement will be start.
Next Steps
you can go some test like CBC and dengue ns1 antigen.
Health Tips
you should follow good life style like a sufficient amount of water with ORS and electral to maintain salt and fluid balance.