Conversation: The conversation between human and AI assistant.
[|Human|] 75 yr old man has large (palm sized) rash equi-distant from center of stomach AND equi-distance from spine (above kidney/waist area) Center of rash is pale, rash on back looks like sunburn. Also has similar rash on front of shin. No insect sting, no sunburn, just huge rash. No known food allergies. Rash on back is very hot to the touch. No itching, no pain, just very large rash. thanks Had shingles vaccine last year. Rash is smooth and splotchy...not rough. Edges are irregular
[|AI|]  Hi, There could be multiple possible differential diagnoses for the rash that you have mentioned. If it is hot to touch, it must be associated with inflammation/infection.  Keep in mind that certain Chat Doctor.  You could apply an antibiotic ointment for a week and if you do not get any improvement, do consult your doctor for proper diagnosis and apt management. Hope I have answered your query. Let me know if I can assist you further. Take care