Proud flesh is an overgrowth of raw, bumpy tissue that rises above the edges of a wound on a horse, preventing the skin from closing over it. Its medical name is exuberant granulation tissue, and it occurs most often on the lower legs. While granulation tissue is a normal part of healing, proud flesh is what happens when that process goes haywire and the tissue keeps growing instead of allowing skin to migrate across the wound surface.
How Normal Healing Goes Wrong
When a horse sustains a wound that can’t be stitched closed, the body fills the gap with granulation tissue, a moist, pink layer rich in blood vessels and connective tissue cells. In a healthy healing process, this tissue fills the wound bed to skin level, then stops growing so new skin cells can gradually creep inward from the wound edges. With proud flesh, the granulation tissue doesn’t stop. It mushrooms above the surrounding skin, sometimes dramatically, and forms a fleshy, protruding mass that blocks skin migration entirely.
The underlying cause is a disrupted inflammatory response. Healing depends on a tightly coordinated balance of growth signals and inflammation. In proud flesh, that balance tips: the connective tissue cells (fibroblasts) overproliferate, blood vessel formation becomes disorganized, and wound contraction stalls. The result is a self-perpetuating cycle where the tissue keeps expanding but never matures into functional skin. Despite decades of research, the exact trigger that flips normal granulation into exuberant growth remains unclear, though chronic inflammation is consistently identified as a central factor.
Why the Lower Legs Are Most Vulnerable
Proud flesh overwhelmingly affects wounds on the lower limbs, from the knee and hock down. Several anatomical factors make these areas uniquely prone to healing problems. The skin on a horse’s lower leg is thin, tightly stretched over bone and tendon, and has very little elasticity compared to the skin on the body or neck. There’s also minimal soft tissue cushioning between the skin and the structures underneath.
Movement is perhaps the biggest contributor. The lower leg is in near-constant motion, and every step shifts the skin relative to the healing tissue beneath it. Wounds near joints, tendons, or tendon sheaths are especially problematic because tendon contraction physically pulls the injured tissue away from the wound surface, disrupting the fragile new blood vessel networks that healing depends on. This repeated mechanical disruption restarts the inflammatory process over and over, feeding the cycle that produces proud flesh. Wounds on the trunk or upper body, by contrast, have loose skin with good blood supply, strong contraction ability, and far less movement, so they rarely develop this complication.
Contamination also plays a role. Lower limb wounds sit close to the ground and are easily exposed to dirt, manure, and bacteria, all of which can sustain chronic inflammation.
What Proud Flesh Looks Like
Proud flesh has a distinctive appearance: a reddish-pink, irregularly bumpy mass that bulges above the wound margins. It bleeds easily when touched but typically isn’t painful. The surface is moist and may look raw or slightly glossy. In mild cases, the tissue rises just slightly above skin level. In severe cases, it can form large, cauliflower-like masses that protrude several centimeters.
One important distinction to keep in mind is between proud flesh and skin tumors called sarcoids. Fibroblastic sarcoids in particular can look similar: they grow rapidly, appear fleshy and ulcerated, and tend to crop up on the legs. The key differences are that sarcoids often occur in clusters of variable size and shape, may invade deeper tissues, and can appear on skin that wasn’t recently wounded. Proud flesh, by definition, develops within an existing wound bed. If a mass appears in an area without a known wound history, or if a wound-related mass behaves unusually (growing back aggressively after removal, spreading to adjacent skin), a veterinarian should evaluate whether it’s actually a tumor rather than simple granulation tissue overgrowth.
How Proud Flesh Is Treated
Treatment depends on how much tissue has overgrown. When proud flesh protrudes significantly above the wound edges, the standard approach is surgical trimming. A veterinarian cuts the excess tissue back to the level of the surrounding skin. Because granulation tissue has no nerve supply, this procedure causes little to no pain and often doesn’t require sedation for small areas, though it does bleed freely.
Once the tissue is trimmed level, the goal shifts to preventing regrowth while encouraging skin cells to move across the wound. Topical steroid ointments are the most common tool for this. Steroids suppress the overactive inflammatory signals that drive tissue overgrowth. Hydrocortisone cream, applied weekly and left unbandaged, can control proud flesh with minimal damage to the delicate new skin cells at the wound edges. This is an important advantage over many caustic “proud flesh” products sold at feed stores, which may burn back the granulation tissue but also destroy the very skin cells needed to close the wound.
For wounds on moving structures like joints and tendons, immobilization can dramatically improve outcomes. Casts reduce the formation of exuberant granulation tissue by eliminating the constant mechanical disruption that fuels it. Even firm support bandages, while less restrictive than a cast, help limit tissue movement and compress the wound bed.
Prevention During Early Wound Care
How you manage a lower limb wound in the first days has a significant impact on whether proud flesh develops. Bandaging choices matter more than most horse owners realize.
Occlusive (airtight, moisture-trapping) dressings encourage exuberant granulation tissue in horses, so they should only be used for the first 6 to 48 hours after injury, if at all. After that initial period, switching to a nonadherent gauze pad produces significantly better outcomes. Research has shown that permeable, nonadherent dressings lead to shorter healing times, less wound discharge, and less proud flesh compared to semiocclusive or fully occlusive alternatives. Silicone-based wound dressings have also shown promise, outperforming conventional nonadherent dressings in preventing granulation tissue overgrowth and improving tissue quality in lower limb wounds.
Limiting movement early on is equally important. Wounds involving tendons, joints (especially the fetlock, carpus, and hock), the pastern, coronary band, or heel bulbs heal faster and with less scarring when the leg is immobilized. A well-applied bandage with firm support, changed regularly, serves double duty: it controls movement and applies gentle compression to the wound bed, both of which discourage tissue overgrowth. Once the wound is well on its way to closing and the bandage is removed, a light application of steroid ointment can help keep any remaining granulation in check during the final stages of healing.
What to Expect During Recovery
Lower limb wounds that heal without stitches are slow by nature, often taking weeks to months to fully close depending on size and location. Proud flesh can extend that timeline considerably if it isn’t managed, because every day the tissue sits above skin level is a day that skin migration is stalled. With prompt trimming and appropriate aftercare, though, the wound can resume closing at a more normal pace.
Recurrence is common, particularly if the underlying factors (movement, contamination, inadequate bandaging) aren’t addressed. Some wounds require multiple rounds of trimming before the granulation tissue finally stays at skin level long enough for the skin to close over it. Wounds near high-motion areas like the fetlock or pastern are the most stubborn. The final healed area will typically be hairless and may look slightly different from surrounding skin, but the tissue is functional and durable once fully closed.