Bit & Bridle

Equine Proud Flesh

Other Names

  • Exuberant Granulation Tissue (EGT)
  • Hypergranulation
  • Over-Proud Flesh

What Is Proud Flesh in Horses?

Proud flesh — medically termed exuberant granulation tissue (EGT) — is a wound healing complication in which the body produces an excessive amount of granulation tissue that grows beyond the level of the surrounding skin, forming a raised, red, cobblestone-like mass that protrudes from the wound. Rather than healing over with new skin (epithelialisation), the wound becomes dominated by this proliferative tissue, which physically obstructs the migration of skin cells across the wound surface and halts normal healing.

Granulation tissue is a normal and essential component of wound healing in horses: it fills the wound bed, provides a vascular scaffold for tissue repair, and forms the platform from which new skin grows. The problem arises when this process becomes dysregulated — granulation tissue continues to proliferate past the level of the skin margins rather than stopping and allowing epithelial cells to migrate across its surface. The result is a wound that grows rather than closes.

Horses are uniquely prone to proud flesh compared to most other species, particularly for wounds located on or below the knee and hock. This anatomical predisposition is thought to relate to the limited skin redundancy in the lower limbs, the constant movement of tendons and joints beneath the wound surface, and the reduced blood supply compared to wounds on the body or neck. Lower limb wounds in horses consistently demonstrate higher rates of proud flesh formation and slower healing than wounds elsewhere on the body.

Causes

Several factors drive the formation of proud flesh:

  • Location: The distal limbs — below the knee and hock — are by far the highest-risk locations. The combination of poor skin elasticity, limited skin redundancy, and constant movement creates conditions that promote excessive granulation tissue production.
  • Movement: Wounds over joints or tendons are subject to constant mechanical disruption with each step the horse takes. This ongoing movement prevents the wound edges from approximating and repeatedly stimulates the granulation response.
  • Wound management errors: Excessive use of certain topical treatments — particularly highly astringent products, corrosive substances, or improper use of wound dressings — can perpetuate inflammation and granulation. Conversely, inadequate wound management that allows chronic wound contamination also promotes EGT.
  • Infection: Infected wounds sustain a chronic inflammatory state that drives continued granulation tissue production rather than allowing the transition to epithelialisation and remodelling.
  • Delayed closure: Wounds that cannot be sutured primarily (due to size, location, or time elapsed) heal by second intention — which in horses is inherently associated with a higher risk of proud flesh development in high-risk locations.
  • Individual variation: Some horses appear intrinsically more prone to EGT formation than others, though the specific genetic or physiological basis for this is not fully characterised.

Symptoms and Signs

  • Raised, red tissue: The wound surface rises above the level of the surrounding skin, often with a distinctive red, glistening, or granular surface. In established cases, the tissue may have a lobulated or cauliflower-like appearance.
  • Failure to heal: The wound does not progress towards closure. Instead of reducing in size, the wound may remain static or appear to enlarge as granulation tissue proliferates.
  • Moist surface: EGT typically has a persistently moist, weeping surface. It does not dry and crust over like healing skin.
  • Bleeding on contact: Proud flesh is highly vascular and bleeds readily when disturbed or bumped. Even minor trauma to the protruding tissue causes significant bleeding.
  • Absence of skin growth: New skin (pink, flat, smooth epithelium) that should be advancing from the wound margins is typically absent or minimal in wounds with established proud flesh, as the raised granulation tissue blocks epithelial cell migration.
  • Variable pain and lameness: Proud flesh itself is not uniformly painful, though the underlying wound and surrounding inflammation may cause lameness depending on depth and location.

Diagnosis

Diagnosis is clinical — the characteristic appearance of raised, red, proliferative tissue in an equine wound is unmistakable to an experienced observer. However, further assessment may be needed:

  • Wound assessment: Determine the depth of the wound, whether underlying structures (tendons, tendon sheaths, joints, bone) are involved, and the extent of contamination or infection.
  • Wound swabs and culture: If infection is suspected, bacterial culture guides antibiotic selection.
  • Radiography: Essential if bone involvement (periosteal reaction, osteomyelitis) is suspected in wounds with significant depth or chronicity.
  • Ultrasonography: Useful for assessing the involvement of tendons and tendon sheaths in deep lower limb wounds.
  • Biopsy: In atypical cases where the tissue appearance raises suspicion of neoplasia (particularly sarcoid, which can mimic proud flesh on the lower limb), biopsy provides a definitive tissue diagnosis.

Treatment

The key principle in treating proud flesh is to reduce the granulation tissue back to the level of the skin margins and then protect the wound to allow epithelialisation to occur without recurrence of EGT:

  • Surgical debridement: Removal of excess granulation tissue using a scalpel under local anaesthesia or sedation is the primary treatment in established cases. The tissue is cut back flush with or just below the skin margins. This is not painful in the EGT tissue itself (granulation tissue has few pain receptors) but must be performed under appropriate restraint as the tissue bleeds significantly.
  • Topical corticosteroids: Corticosteroid-containing wound preparations (such as those combining a steroid with an antibacterial agent) inhibit excessive granulation tissue formation. They are typically applied after debridement to prevent recurrence. Overuse must be avoided as long-term steroid application delays healing.
  • Pressure bandaging: The single most effective preventive and management tool for lower limb wounds prone to proud flesh. A well-applied pressure bandage limits movement, reduces wound swelling, and physically compresses the granulation tissue. Bandages must be applied correctly to avoid pressure sores.
  • Infection control: Any concurrent infection must be addressed with appropriate topical or systemic antibiotics. Infected wounds cannot heal normally.
  • Caustic agents: Historically, caustic substances (copper sulphate, salicylic acid preparations) were used to “burn back” proud flesh. These are largely discouraged in modern practice as they cause significant tissue damage, including to the surrounding skin and underlying structures, and do not provide controlled, predictable debridement.
  • Skin grafting: In large wounds with significant proud flesh that have been reduced and stabilised, pinch or punch skin grafts can be placed to accelerate epithelialisation and prevent recurrence of EGT. Grafting is performed under general anaesthesia or deep sedation.

For further reading on wound complications, see our articles on Equine Quittor and Equine Canker. The BEVA provides guidance on equine wound management and referral pathways.

Prevention

  • Seek prompt veterinary assessment for all wounds below the knee or hock — early primary closure (suturing) of a fresh wound is far preferable to managing a granulating wound for months.
  • Apply appropriate bandaging to all lower limb wounds from the outset — a properly applied pressure bandage limits swelling, reduces movement, and is the most important single preventive measure against proud flesh.
  • Follow veterinary wound management advice carefully. Do not apply products not recommended by your vet — some owner-applied topical treatments perpetuate inflammation and promote proud flesh.
  • Keep wounds clean and protected from contamination throughout healing.
  • Restrict movement appropriately — a horse allowed to exercise freely on an unhealed lower limb wound is significantly more likely to develop proud flesh than one kept on restricted work or box rest.

Prognosis

Prognosis depends heavily on wound size, depth, location, chronicity, and whether underlying structures are involved. Superficial wounds with early EGT that are promptly and correctly treated — debridement, pressure bandaging, appropriate topical care — generally heal well with a good cosmetic and functional outcome. Large, deep, or neglected wounds with extensive EGT are more challenging, require longer treatment, and may result in permanent scarring or functional limitation if over tendons or joints. Wounds with involvement of tendons, tendon sheaths, or joints carry a significantly more guarded prognosis for return to athletic use and require intensive, specialist-level management.

When to Call the Vet

Consult your vet for all wounds below the knee or hock in horses. Specifically:

  • Any wound that does not show clear progress towards closure within two to three weeks despite basic wound management
  • Tissue rising above the level of the skin margins — early intervention prevents established proud flesh
  • Significant lameness associated with a wound
  • A wound with synovial fluid (clear to slightly yellow, watery joint fluid) visible — this indicates penetration of a joint or tendon sheath and is a surgical emergency
  • Any wound that bleeds excessively on minimal contact or appears infected

Frequently Asked Questions

Why do horses get proud flesh more than other animals?

Horses have a species-specific tendency to over-produce granulation tissue in lower limb wounds. The limited skin redundancy in the distal limbs, the movement stress at wound sites during normal locomotion, and possibly evolutionary differences in inflammatory signalling all contribute. In contrast, horses heal body wounds (above the knee and hock) very efficiently and rarely develop significant proud flesh in these locations.

Can I treat proud flesh myself with copper sulphate?

Copper sulphate is caustic and causes tissue damage beyond just the proud flesh — it damages surrounding skin, underlying structures, and can delay rather than facilitate healing. Its use is not recommended in modern equine wound management. Proud flesh should be assessed and treated by a veterinary surgeon, who can perform controlled surgical debridement and apply appropriate topical treatments safely.

How long does proud flesh take to heal after debridement?

After successful debridement back to skin level, wounds that are properly managed with pressure bandaging and appropriate topical treatment can epithelialise over several weeks to months depending on their size. Small wounds may close in three to six weeks; large wounds on the lower limb may take three to six months or longer, particularly if skin grafting is not performed.

Is proud flesh a form of cancer?

No. Proud flesh is excessive but normal granulation tissue — it is not malignant or premalignant. However, it is important to distinguish EGT from equine sarcoid, a skin tumour that can occur in wounds on the lower limb and may resemble proud flesh in appearance. If a “wound” does not behave as expected or has an unusual appearance, biopsy should be performed to confirm the diagnosis before assuming simple EGT is present.