You may be experiencing some damage to the nerve that serves the penis, and surrounding area. You would need to see a doctor for some sensation testing to establish the pattern of the area affected and perhaps a CT or MRI of the lower back. If there is any problem with loss of bladder, bowel or sexual function with or without back or leg pain then go direct to ER for an urgent assessment as a compressed nerve causing these problems needs urgent attention to prevent long term damage.
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