Some can correct themselves. Vitamins can help, sometimes surgery may be needed.
If the problem has been present for a long time and is causing you sexual difficulties (such as impotence, difficulty with penetration, or pain during sex for either partner), they may refer you to a urologist. You might need surgical treatment to correct the deformity. It is unwise to seek surgical treatment solely for cosmetic reasons.
Here is one site that explains this in more detail along with a list of treatment options.
read here
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