The scarring process of the penis is more common after trauma and also in diabetics. The scarring process causes curvature of the penis on the side where the scar does not allow stretching of the penis on erection. The scarring process can cause; shortening, pain, curvature and even erectile failure if it affects blood flow to the central tissue of the penis (corpus cavernous).
If you develop Peyronie’s disease, the first problem you may notice is painful erections and areas of thickening along the shaft of the penis. You may notice that the penis starts to become curved, angled or distorted. This is most obvious when the penis is erect but can occasionally be seen even when it is soft (flaccid). This period of pain with erection usually lasts 18-24 months and is known as the inflammatory phase. This is followed by a fibrotic stage in which the pain settles but scarring continues to develop and the distortion of the penis continues. About half the men who develop Peyronie’s disease also develop depression.