Most cysts feel like a firm, round lump that rolls under your fingers when you press on it. They typically have smooth edges, sit just beneath the skin, and range from pea-sized to several centimeters across. But not all cysts are ones you can touch. Internal cysts, like those on an ovary or behind the knee, produce distinct pressure and pain sensations that vary by location.
How a Cyst Feels Under the Skin
The most common cysts people discover on their own are epidermal cysts (often called sebaceous cysts). These form just below the skin’s surface and are filled with a thick, protein-rich material called keratin. That filling gives them a firm texture, noticeably different from the surrounding soft tissue. When you press on one, it usually feels like a small marble or ball that shifts slightly under the skin. The borders are smooth and well-defined, and the overlying skin moves freely over it.
Most epidermal cysts are painless unless they become irritated or infected. You might not even notice one until you run your hand over the area and feel the bump. They commonly appear on the face, neck, scalp, and trunk, and they tend to grow slowly over months or years.
How Different Cyst Types Compare
Ganglion cysts, which develop near joints and tendons (most often the wrist), feel different from skin cysts. They’re filled with a thick, jellylike fluid similar to joint lubricant. The result is a round or oval bump that can feel either squishy or quite firm depending on how much fluid is inside. A tense ganglion cyst near a tendon can feel almost as hard as bone, which often alarms people. These cysts may change size, shrinking when the joint is at rest and swelling with repetitive use.
A Baker’s cyst forms behind the knee and produces a distinct sensation of tightness and fullness in that area. Rather than a discrete lump you can roll between your fingers, it feels more like a fluid-filled bulge. The pain tends to worsen with activity or when you try to fully straighten or bend the knee, and stiffness is common.
How to Tell a Cyst From Other Lumps
People often worry that any new lump could be something serious, so knowing the tactile differences matters. Cysts are firm and have smooth, defined edges. They feel like they could roll around under your fingers. Lipomas, by contrast, are softer and doughier, almost like pressing into a piece of bread dough. They also move easily when pushed, but they lack the firm, contained feel of a cyst.
The lumps that raise more concern tend to feel very hard (like a stone rather than a marble), have irregular or jagged edges, and feel fixed in place rather than mobile. A cyst that you can nudge around beneath the skin is a reassuring sign, though any new or changing lump is worth having evaluated.
Ovarian Cysts and Internal Sensations
You can’t feel an ovarian cyst with your hands, but your body often signals when one is there. Small ovarian cysts frequently cause no symptoms at all and resolve on their own within a few menstrual cycles. Larger ones produce a dull ache or sharp pain on one side of the lower abdomen, below the bellybutton. Many people describe a sense of fullness, pressure, or heaviness in the belly, along with bloating that doesn’t seem related to eating.
These sensations can come and go, which sometimes leads people to dismiss them as digestive issues. The pain may flare during certain activities, sex, or around specific points in the menstrual cycle.
When an Ovarian Cyst Ruptures
A ruptured ovarian cyst causes sudden, sharp pain in the lower belly or back. Not every person feels the moment of rupture, but most experience pain at the time it happens followed by several days of lingering discomfort. If the cyst is large or causes significant internal bleeding, the pain can be severe enough to make you double over. Nausea, dizziness, and feeling faint can accompany it.
A related emergency is ovarian torsion, where the cyst causes the ovary to twist on itself. This produces sudden, severe pelvic pain along with nausea and vomiting. It comes on fast and doesn’t let up.
What an Infected Cyst Feels Like
An uncomplicated cyst is usually painless or mildly tender. Infection changes that quickly. The skin over and around the cyst becomes red, swollen, and warm to the touch. The lump itself grows more tender, and many people describe a throbbing or pulsing pain that worsens over hours. Pressing on it hurts noticeably more than before.
If the infection progresses to an abscess (a pocket of pus), the pain can become intense. The area may feel hot compared to surrounding skin, and you might notice drainage of thick, foul-smelling fluid if it opens on its own. An infected Bartholin’s cyst, which forms near the vaginal opening, can make sitting or walking painful within a day or two of the infection starting.
Signs a Cyst Needs Attention
Most cysts are harmless, but certain changes in how one feels should prompt an evaluation:
- Rapid growth: a cyst that visibly increases in size over days or weeks rather than months
- Pain or tenderness: a previously painless lump that starts hurting
- Size over 5 centimeters: roughly the size of a golf ball
- Skin changes: redness, warmth, swelling, or drainage around the cyst
- Firmness or fixity: a cyst that becomes rock-hard or stops moving freely under the skin
A cyst that ruptures on its own may ooze a thick, cheese-like material and temporarily flatten, but the sac underneath often remains. This means it can refill over time, which is why surgical removal of the entire sac is the only way to permanently eliminate a recurring cyst.