It isn't possible to say very much, with no additional description. But painful with soap and/or water suggests it may have opens sores? Or blisters or pimple-like bumps? If so, herpes zoster (shingles) is a good bet. If there are such lesions, see a doctor ASAP: effective treatment is available, but only if started early, so don't delay. Good luck.
Answered 1/16/2022
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