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Hello I'm Dr Chip
Could you please post a photo of the rash on this page for me?
But what did you mean by keeping water down?
Where's the back pain located exactly and do you have a fever?
First off the rash is what's called keratosis pilaris--a kind of dry skin problem but not related to your kidneys
And with pain on both sides of your back and no fever I don't think this is a kidney infection
But the back pain may be more of a disk problem so I might consider an MRI of your lumbar spine
Please let me know if you need any more information