Your doctor may be able to tell if you have Peyronie’s disease through a physical exam. During the exam, they will check for plaque hardening to feel whether the penis is stiff or not.
Another examination includes injecting a drug into the penis to make it stiff and taking pictures to study it. The plaques mostly form on the top side of the penis and can make the penis bend upwards when it stiffens.
If plaques form on the bottom side of the penis, it will bend downward or sideways.