<s>[INST] Last Sunday night and Monday night I had sensitive skin and severe chills. The chills lasted about 2 1/2 ours and my body was shaking spastically. I couldn t do anything to stop the chill. Throughout the week, my skin has felt sensitive and I had some minor chills. Last night I had severe shaking and chills again for about 2 1/2 hours. I had a terrible headache all night. This morning I woke with a rash all over my face, chest, stomach and back. What could this be? [/INST] Hi, In my opinion, you could be suffering from a viral exanthem. Other possible diagnosis is drug hypersensitivity reaction. Try to rule out drug induced rash by remembering the drugs that you have taken. As the rash is extensive and you have fever, I request you to consult your Dermatologist immediately to get proper treatment. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Siva Subramanian, Dermatologist </s>