Peyronie disease - a lump caused by injury, or unknown , to the blood vessels of the shaft,scar tissue calcifies and becomes hard and plaque can spread slowly causing tension on fibres within the penis ,due to loss of elasticity it is often associated with an upward curve
in the tip when erect (this nomally follows
in the weeks after finding the
lump) , if the lump is below the curve would be downwards when erect . Most common in middle age. Easily diagnosed with ultrasound .