 [ Symptoms ] i have rash spreading through my body [ Disease ] hi and thanks for posting your question doctors if i have to give a diagnosis for your case then i would ask for some labs before going further blood tests such as antinuclear antibody ana to look for lupus complete blood count cbc liver function tests lft to look for rashes related to hepatitis and thyroid function tests then you can see a dermatologist to see the results so you can get the right treatment