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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)
HPV can cause bumps on the penis. Another STD that can produce small bumps on penis or surrounding area is human papillomavirus (HPV), the virus that causes genital warts. Typically, warts are found in small clusters, are the same color as the surrounding skin, and grow in patches. They are typically not painful.