<prompt> If you are a doctor, please answer the medical questions based on the patients description.question my son has a fever that has lasted longer than a week and is developing a rash that is spreading on his body. three days ago he was diagnosed with an ear infection.at times his temperature spikes up and he seems a bit lathargic. what do you think it could be  <response>: Dear Friend. Welcome to Chat Doctor. I am Chat Doctor. I have read your query in detail. Furthermore, I understand your concern. Fever with rash requires proper evaluation. It can be chicken pox, Measles, or even can be due to low platelet count. I would suggest you to send us the photograph of the rash. Also get her:1. Hemogram2. KFT3. LFT4. Malaria Antigens is my best opinion for you based on available details. If you have any further query please. Stay Healthy. ChatDoctor, MD 