An implanted port looks like a small, round bump under the skin, roughly the size of a quarter. It raises the skin about half an inch (1.2 centimeters) above the surrounding area. You can usually see it as a subtle raised disc, and you can feel it clearly by pressing gently with your fingertips.
What You’ll See and Feel
From the outside, a port appears as a smooth, firm lump just beneath the surface of the skin. The skin over it looks normal in color and texture once healed, though it may be slightly stretched. The bump has a flat, circular shape with a raised center. That raised center is the septum, a self-sealing rubber piece designed to accept a needle over and over without leaking.
In most people, the port is visible as a small mound, especially in thinner individuals. In people with more body fat, it may be harder to spot visually but still easy to locate by touch. Under clothing, it’s barely noticeable. It sits flush enough against the body that most shirts, bras, and jackets cover it without any obvious outline.
Where It Sits on the Body
The most common location is the upper chest, typically on the right side, a few inches below the collarbone. This is where the majority of ports are placed because the underlying veins provide a direct route to the heart, which is where the catheter tip needs to end up. Some people get ports placed on the inner side of the upper arm or in the abdomen below the ribcage, depending on their medical situation. Chest placement on the lateral (side) wall is another option when the standard spot isn’t ideal.
What’s Actually Under the Skin
The visible bump is a small reservoir, about the size and shape of a thick coin, made of metal or plastic with the rubber septum on top. Attached to the reservoir is a thin, flexible tube (catheter) that threads through a vein and ends near the heart. The entire device sits in the layer of fatty tissue between the skin and the muscle, typically 0.5 to 2 centimeters deep. Surgeons aim for enough tissue coverage to protect the port without burying it so deep that it’s hard to access with a needle.
You won’t see the catheter at all. It runs under the skin from the port to the vein entry point, leaving no visible trace along its path.
Scars Around the Port
Placing a port requires one or two small incisions. The incision over the port pocket itself is usually less than an inch long, just wide enough for the surgeon to slide the reservoir under the skin. There may be a second, smaller incision near the base of the neck or along the collarbone where the catheter enters the vein. Both scars fade over time and tend to flatten into thin white or pink lines within several months.
How It Looks When Being Used
When a port is accessed for treatment, a special non-coring needle is pushed through the skin and into the rubber septum. The needle stays in place, held down by a transparent adhesive dressing. During this time, you’ll see the dressing taped over the port area with tubing running from it to an IV line. Between treatments, the needle is removed and the skin looks the same as before: just the small bump with no external hardware.
Changes to the Skin Over Time
For most people, the skin over the port stays healthy for years. The area may develop minor bruising after needle access, which fades within a few days. Over the long term, repeated needle sticks in the same spot can thin the skin. In rare cases (under 3% with proper placement depth), the skin can erode, gradually breaking down until the device becomes partially exposed. This is more likely when the port was placed too close to the skin surface or when the needle consistently enters the exact same point.
Signs that the skin is wearing down include persistent redness, tenderness that doesn’t resolve between treatments, scabbing, or visible thinning over the center of the port. If the skin over your port starts to look different from how it normally appears, that’s worth bringing up at your next appointment.
What It Looks Like After Removal
Once a port is removed, you’re left with a small scar where the original incision was made. The bump disappears immediately since the device is no longer there. Some people notice a slight indentation or soft spot where the port pocket was, especially if the device was in place for a long time and the tissue had conformed around it. The skin gradually fills back in, and within a few months the area typically flattens out, leaving only the scar line as a permanent mark.