Hello there, I am dr.milan an infectious disease specialist answering your question. Rash in dengue comes in higher severe infection. There are many causes of fever with rash. One of it is Dengue. We need to know is there other symptoms like joint pain, body pain, fever pattern, headache, any other site bleeding etc. I suggest you to go for investigation of your blood like complete and differential blood count. And visit your physician immediately before it may worsen. We need to be careful. Dengue can be diagnose by simple test which can be followed after primary investigation. If it is not dengue and if it is other we can conclude towards something. Hope i have given appropriate guidance to you. if you have any query you can consult me anytime. Give me star rating, helpful vote & thank you according to your satisfaction level. Thanking you.