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Possible underlying causes of a bent penis include: 1  Normal differences in penis anatomy. 2  Autoimmune disorder. 3  Inherited fibrous tissue (collagen) abnormality.  Injury to the 1  penis. Peyronie's disease (a curved erection caused by one of a number of underlying conditions)
Outside of STDs there are two infections that can cause blisters and sores to appear on the penis. Scabies, a type of contagious skin infection that is caused by a parasite, can sometimes cause blisters or lesions on the penis. It is often accompanied by an itching feeling, which may lead to the formation of a rash or blisters.