Usually drug rash starts in first or second dose of the antibiotic and so since it is 10 days after the intake of your antibiotic, it is due to some other cause. you may be suffering from fever with rash which needs complete blood count exam to find out the cause. usually fever rash occurs in viral fever. since it is 10 days over you can stop the antiobiotic and consult your doctor for going through investigation for fever. you can take multivitamins to correct vitamin deficiency due to poor intake in fever. For more details you have to furnish more details about your onset of fever associated symptoms like body pain head ache or joint pain, presence of enlarged lymph glands in ankle or groin and the nature of fever like is it continuous or intermittent , occurring with rigors etc. you have to also tell about whether you have any ulcer or septic foci in your body which may cause fever