Peyronie’s disease causes a visible bend or curve in the penis during erection, along with hard lumps of scar tissue you can feel under the skin. The curve can range from barely noticeable (around 5 degrees) to severe (60 degrees or more), and the direction, shape, and degree vary widely from person to person. Here’s what to look for and how to tell it apart from normal variation.
The Curve Itself
The most recognizable sign is a bend in the penis that appears during an erection. The curve happens because flat bands of scar tissue, called plaque, form inside the shaft and prevent that section from expanding normally. The most common direction is upward (dorsal), but the curve can also go downward (ventral), to either side (lateral), or in a combination of directions. In rare cases, the penis may twist or rotate along its axis.
Some curves are simple, bending in one direction. Others are biplanar, meaning the penis curves in two directions at once, creating an S-shape or corkscrew appearance. The degree of curvature doesn’t always match the size of the plaque underneath. A small patch of scar tissue in the right spot can produce a dramatic bend.
To put the numbers in perspective: a 5-degree curve looks like the minute hand on a clock at 9:13, barely off-center. A 30-degree curve looks more like 9:10. Many people with curves under 30 degrees don’t need treatment if the bend isn’t causing pain or problems with sex. Curves above 60 degrees typically make intercourse difficult or impossible.
What the Plaque Feels Like
Even before a curve becomes obvious, you may be able to feel the scar tissue. It shows up as flat lumps or a band of hard tissue just under the skin of the shaft. The area over the plaque sometimes feels tender to the touch. Plaque can develop anywhere along the penis, on the top, bottom, or sides, and there can be more than one spot.
A urologist can usually feel these plaques whether the penis is erect or not. You can check yourself by gently rolling the shaft between your fingers. What you’re feeling for is anything that feels distinctly harder or firmer than the surrounding tissue, like a small ridge, knot, or flat pebble embedded under the skin. In some cases the plaque calcifies over time. Ultrasound studies have found calcification in about 34% of men with the condition, which makes the hardened area feel even more rigid and stone-like.
Beyond the Curve: Other Shape Changes
Peyronie’s doesn’t always present as a simple bend. Several other deformities can develop, sometimes alongside curvature and sometimes on their own.
- Hourglass deformity: A band of plaque wraps partly or fully around the shaft, creating a visible narrowing or indentation in the middle. The penis looks pinched inward at that point, like an hourglass.
- Hinge effect: Instead of a smooth curve, the penis buckles at the plaque site during erection, creating an unstable “hinge” that makes the shaft bend or fold under pressure.
- Shortening: The scar tissue can contract the internal structures, pulling the penis shorter. The average loss is about 1 to 1.5 centimeters, though some men lose more.
These changes are most apparent during a full erection. When flaccid, the penis may look completely normal or show only subtle signs like a slight curve or a palpable lump.
How It Changes Over Time
Peyronie’s disease goes through two phases, and what you see depends on which phase you’re in.
During the acute (active) phase, the plaque is still forming. Pain during erections is common, and the curve may worsen over weeks or months. The plaque tends to feel softer at this stage because the scar tissue hasn’t fully matured. You might notice the curve changing direction or severity from one week to the next.
The chronic (stable) phase begins once the plaque stops growing, usually 12 to 18 months after symptoms first appeared. Pain typically fades, the curve stabilizes, and the plaque feels harder and more defined. If calcification develops, it usually shows up during this phase, making the lumps feel almost like small stones.
Peyronie’s vs. Normal Curvature
Not every penile curve is Peyronie’s disease. Many men have a slight natural curve that has been present since puberty. This is called congenital curvature, and it’s a normal anatomical variation with no scar tissue involved. The key differences are straightforward.
Congenital curvature is present from the first erections in adolescence, stays consistent over time, and involves no palpable lumps or plaques. Peyronie’s disease typically appears later in life (the average age at diagnosis is in the mid-50s), develops over weeks to months rather than being lifelong, and comes with detectable scar tissue under the skin. Congenital curves also tend to be painless from the start, while Peyronie’s often involves pain during the early phase. If you’ve had a curve your whole life and it hasn’t changed, it’s almost certainly not Peyronie’s.
Conditions That Can Look Similar
A couple of other conditions can create firm lumps or cord-like structures on the penis that might be confused with Peyronie’s plaques.
Sclerosing lymphangitis produces a firm, cord-like swelling that usually appears near the head of the penis or wraps around the area just behind it. Unlike Peyronie’s plaque, this cord moves freely under the skin when you push it, and it’s typically painless. It’s caused by a blocked lymphatic vessel, not scar tissue, and it usually resolves on its own.
Penile Mondor’s disease involves a firm cord along the top of the shaft, but it’s a clotted vein rather than a scar. It feels fixed to the skin above it (unlike the mobile cord of lymphangitis) and can cause throbbing pain during erections. It also tends to resolve without treatment over several weeks. Neither of these conditions causes the progressive curvature or shape changes that define Peyronie’s.
What to Look For in Practice
If you’re checking yourself, the clearest signs of Peyronie’s disease are a new curve that wasn’t there before, one or more hard lumps under the skin of the shaft, and any change in the shape of the penis during erection (narrowing, shortening, or buckling). Pain during erections that started recently is another red flag, especially if it coincides with a developing curve.
The combination of a palpable plaque plus a curve that appeared in adulthood is the hallmark. A urologist can confirm the diagnosis with a physical exam and, if needed, an ultrasound to map the plaque and check for calcification.