Granulation tissue is the moist, bumpy, red tissue that forms in an open wound as it heals. It has a distinctive cobblestone-like surface, often described as pebbled or granular, and its deep pink-to-red color comes from the dense network of tiny new blood vessels growing through it. If you’re checking a healing wound and see this kind of tissue filling the wound bed, that’s generally a good sign.
What Healthy Granulation Tissue Looks Like
Healthy granulation tissue is shiny, moist, and red or deep pink. Its surface is uneven and mounded, sometimes compared to the texture of cobblestones or raw ground beef. Those small bumps are actually loops of newly formed capillaries pushing up through the tissue, which is why the color is so vivid. The tissue feels soft and bleeds easily if bumped or disturbed, even with gentle contact. A thin layer of clear or slightly yellowish fluid on the surface is normal.
The rich blood supply is the defining feature. New blood vessels sprout from existing ones at the wound edges and grow inward, delivering oxygen and nutrients that fuel further healing. Cells called fibroblasts fill in between these vessels, laying down the structural framework that will eventually become scar tissue. This combination of dense capillaries and new connective tissue is what creates both the color and the bumpy texture.
When Granulation Tissue Appears
Granulation tissue forms during the proliferative phase of wound healing, which is the body’s “rebuilding” stage. This phase typically starts around day four after an injury and can last up to three weeks or longer, depending on the wound’s size, depth, and location. Before granulation begins, the wound goes through an initial bleeding and clotting stage, followed by an inflammatory phase where the area becomes red, warm, and swollen as the immune system clears debris and bacteria.
In a clean, well-managed wound, you’ll usually see the first patches of granulation tissue within the first week. It starts at the wound edges and base, then gradually fills the entire wound bed from the bottom up. Once the wound bed is fully covered with granulation tissue, skin cells migrate across its surface to close the wound, a process called epithelialization. New skin growing over granulation tissue looks pale pink or silvery at the wound margins.
Granulation Tissue vs. Slough and Eschar
Not all tissue in a wound bed is healthy, and being able to tell the difference matters. Slough is dead tissue that hasn’t been cleared away. It looks yellow, tan, green, or brown, with a soft, stringy, or mucus-like consistency. It may sit loosely on the wound surface or cling to the base. Slough signals that the wound is struggling to progress and often needs to be removed before healthy granulation can develop underneath.
Eschar is another type of dead tissue, but it’s dry and firm rather than wet. It appears black or dark brown and feels hard and leathery, sometimes firmly attached to the wound bed. Soft, boggy eschar is darker tissue that feels spongy and may have drainage around it. Neither type is a sign of active healing.
The key visual contrast: granulation tissue is red, moist, and bumpy. Slough is yellow-brown and soft. Eschar is dark and dry. A wound can contain a mix of all three at the same time, with healthy granulation growing in some areas while dead tissue persists in others.
What Unhealthy Granulation Looks Like
Granulation tissue that looks pale, dusky, or dark rather than bright red may not be getting enough blood flow. Healthy granulation is pink to red and shiny. When it turns pale, grayish, or dull, the tissue isn’t receiving adequate oxygen, which can slow or stall healing. This can happen with conditions that affect circulation, like diabetes or peripheral artery disease, or when there’s too much pressure on the wound.
Granulation tissue that bleeds very easily, appears excessively red or “beefy,” and produces increasing amounts of fluid can be a sign of infection. Other indicators of an infected wound include increased pain, warmth, swelling, odor, and a change in the color or amount of drainage.
Hypergranulation: When Tissue Overgrows
Sometimes granulation tissue grows too much, rising above the level of the surrounding skin rather than staying flush with it. This overgrowth is called hypergranulation, or “proud flesh.” It appears as a mound of light red or dark pink tissue that is smooth or bumpy, soft to touch, moist, and prone to bleeding. It extends beyond the wound edges like the tissue is bulging outward.
Hypergranulation happens when the inflammatory response goes on too long or when something keeps irritating the wound. Common triggers include excess moisture in the wound environment, friction from a bandage or medical device rubbing against the tissue, infection, or a foreign body trapped in the wound. Around surgical sites like feeding tube openings, it often develops during the first six weeks while the site is still maturing.
The problem with hypergranulation isn’t just cosmetic. That raised tissue acts as a physical barrier, blocking skin cells from migrating across the wound surface to close it. Until the overgrowth is addressed, the wound essentially stalls. Treatment usually involves reducing moisture, minimizing friction, or having a clinician reduce the excess tissue so the normal healing process can resume.
Tracking Your Wound’s Progress
If you’re monitoring a healing wound at home, the color and texture of the wound bed tell you more than almost anything else. A wound that’s progressing well will show increasing amounts of red, bumpy granulation tissue filling the base, with pale pink new skin slowly creeping in from the edges. The wound should be getting smaller over time, and drainage should gradually decrease.
Signs that healing has stalled or reversed include a wound bed that stays yellow or gray, tissue that turns pale or dark, increasing pain, new odor, or a wound that stops shrinking or starts getting larger. Granulation tissue that was once healthy-looking but becomes friable (crumbling or bleeding at the slightest touch) or develops a thick, ropey texture deserves attention. Changes in color from bright red to dull or dusky are particularly worth noting, as they often reflect a shift in blood supply or the onset of infection before other symptoms become obvious.