Flock health
Bumblefoot in Chickens: Causes, Signs, Prevention and When to See a Vet
Bumblefoot (plantar pododermatitis) is a bacterial infection of a chicken's footpad, usually by Staphylococcus aureus, that starts when a cut, scrape or puncture lets bacteria under the skin; it shows up as a swollen, warm pad, often with a black scab, and a bird that limps (University of Maryland FS-1179; Merck Veterinary Manual; Ohio State). Most of the risk comes from the coop: rough or badly built perches, wet litter, hard floors and heavy body weight. This page summarizes extension and veterinary guidance. It gives no treatment, dosing or surgery steps: those belong with a veterinarian.
Short version: check feet during every hen health check. Keep perches smooth and low for heavy birds, bedding clean, dry and deep, and floors free of splinters and sharp wire. Separate a bird with a swollen pad or black scab and get it to a veterinarian early, while the lesion is still soft (UC Cooperative Extension; UNH/UConn).
Jump to: Stages · Causes · Signs and look-alikes · Prevention checklist · When to see a vet
What bumblefoot is and how it progresses
Merck lists bumblefoot among local S. aureus infections and says it "is often precipitated by injuries that allow contamination of subcutaneous tissue in the footpad." Other bacteria, including E. coli and Pseudomonas, can be involved (UC Cooperative Extension; Lin). Staph is present wherever chickens are kept (UNH/UConn), so the wound is what to prevent. Merck notes the condition is more common in heavier birds and in males.
| Grade (Maryland FS-1179) | What it looks like |
|---|---|
| I | Surface redness, shiny skin or small lesions; no apparent infection |
| II | A lesion with infected tissue, no swelling |
| III | An infected lesion with swelling |
| IV | A plug of dead tissue, infection in the foot, mild lameness |
| V | Swelling around the plug, severe lameness |
Left untreated, the infection "often progresses and eventually extends to underlying tissues, including tendons, bones, and joints" (Lin, Today's Veterinary Practice). The UNH/UConn fact sheet calls it a chronic disease that, untreated, can result in a 50 percent mortality rate.
- Healthy footpad: relatively flat and free of scabs, swelling and discoloration (Ohio State).
- Toes: the toes and the spaces between them should be free of swelling and discoloration (Ohio State).
- Early signs: redness, a shiny surface or small lesions (Maryland grade I); the area may feel warm.
- Black scab over swelling: the sign of bumblefoot Ohio State describes, over a hard, pus-filled abscess (UNH/UConn).
- Advanced: swelling spreads, and infection can reach tendons, joints and bone (Lin).
- 18 inches: UNH/UConn says to keep perches below this, because heavy birds jumping down from higher perches can break the skin.
- 3 feet: Utah State's upper limit; higher roosts may bruise feet as hens mount them.
- Floor: clean, dry, deep bedding (UNH/UConn), not wire, gravel, concrete or hard-packed ground (Virginia Tech).
Causes and risk factors
| Risk factor | Why it matters |
|---|---|
| Rough or poorly built perches | Rough perches and splinters break the skin (UNH/UConn); scrapes from poorly constructed perches let bacteria in (UC Cooperative Extension); poor perch design can cause pressure sores (Lin) |
| Landing height | A heavy bird jumping from a perch more than 18 inches off the floor can cause a small break in the skin, and the heavier the bird, the greater the risk (UNH/UConn). Lin says older birds benefit from perches closer to the ground |
| Wet or dirty litter | Damp litter harms footpads (Virginia Tech) and encourages bacteria (UC Cooperative Extension); Merck links poor litter management to footpad injuries |
| Hard or abrasive floors | Wire, gravel, concrete and hard-packed ground can cause bumblefoot (Virginia Tech); toenails can catch in wire floors (UC Cooperative Extension) |
| Weight and diet | Obesity puts extra pressure on both feet, especially in older birds (UC Cooperative Extension); Merck says overweight backyard birds are far more common than thin ones. Lin lists lack of biotin or vitamin A; Maryland stresses a balanced diet with vitamin A |
| Other injuries | Puncture wounds (Jacob, Kentucky), protruding wires, fighting and cannibalism (Merck); lameness in one leg overloads the other foot (UC Cooperative Extension) |
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Photo: Sylvain Larrat / CC BY 4.0, via Wikimedia Commons
Signs and look-alikes
Signs the sources list: limping or reluctance to walk; a swollen, warm footpad; redness around a scab; a hard, pus-filled abscess under a black scab; and, as it worsens, ulcers (Maryland; UNH/UConn; Merck). Lin adds weight loss and a bird keeping to itself. When one leg is lame, examine the other foot closely too (UC Cooperative Extension).
| Look-alike | How it differs |
|---|---|
| Scaly leg mites | Raised, enlarged, flaky or upturned leg scales rather than a footpad lesion (Ohio State; UC Cooperative Extension). See mite treatment options |
| Articular gout | Urate deposits (tophi) around the joints; a vet confirms it by finding the crystals (Lin) |
| Arthritis, tendonitis | Can look similar and should be ruled out (Lin) |
| Lame with normal feet | Virginia Tech lists vitamin D3 or riboflavin deficiency, splayed legs and pulled muscles or slipped joints among other causes |
Prevention checklist
- Perches: smooth, non-abrasive material (UC Cooperative Extension), rounded edges and more than one diameter and height (Lin). UC Cooperative Extension suggests a square bar about 2 inches across; Utah State calls 2 × 2 with rounded tops ideal. Bar sizes and roost space by source are on roosts and perches.
- Perch height for heavy birds: UNH/UConn says under 18 inches; Utah State gives about 3 feet as the upper limit for roosts in general.
- Bedding: clean, dry and deep (UNH/UConn); soft and absorbent, with wet litter removed or turned (Virginia Tech; Lin). Materials compared: coop bedding and litter.
- Floors and ramps: solid floors rather than wire (UC Cooperative Extension); avoid hard or slippery surfaces and give ramps good traction (Virginia Tech).
- Hazards: remove splinters, protruding wires and sharp edges (Merck; UNH/UConn).
- Diet and weight: a complete layer ration rather than lots of scratch or seed (UC Cooperative Extension), and no overfeeding (Lin).
- Foot checks: Ohio State advises regular foot inspections to catch early signs; deal with scrapes and punctures promptly (UNH/UConn).
When to see a vet
- Act early. UC Cooperative Extension advises isolating a bird with suspected bumblefoot and calling a veterinarian. UNH/UConn says treatment is more likely to succeed while the lesion is soft and pliable than once it is rock hard; Lin reports stage 1 to 2 cases often respond well once the causes are fixed.
- Do not cut it out yourself. Virginia Tech says not to try to cut out the lesion: "These types of invasive procedures should be performed by a veterinarian."
- What a vet may do. Lin describes radiographs to stage the condition and culture testing; advanced cases can take weeks and several surgeries, and euthanasia may be discussed once bone or joints are badly involved.
- Eggs and medicines. Any drug leaves residues in eggs, many backyard treatments are extra-label and need a veterinarian's prescription, and label withdrawal times apply (Kansas State, FARAD). Federal rules require a veterinarian-client relationship before prescriptions, so find a poultry vet before an emergency (UW–Madison).
- Protect yourself. People do not get bumblefoot, but S. aureus can infect humans: wear gloves and wash your hands (UC Cooperative Extension; UNH/UConn). See also biosecurity.
HenClass summarizes official and veterinary guidance and gives no veterinary advice, doses or procedures.
Sources
- University of Maryland Extension — Leg Health in Chickens (FS-1179, Magnaterra and Weimer, October 2021, PDF)
- Merck Veterinary Manual (Yuko Sato) — Staphylococcosis in Poultry (reviewed January 2025)
- Merck Veterinary Manual (Yuko Sato) — Common Management-Related Problems in Backyard Poultry
- Virginia Cooperative Extension — Leg and Foot Disorders in Domestic Poultry (APSC-193NP, Jacobs and Clauer, 2023)
- UNH Cooperative Extension and University of Connecticut — Bumblefoot (small flock fact sheet, Savage and Darre, 2008, PDF)
- Maurice Pitesky, UC Cooperative Extension — The Dirt on Bumblefoot (Acreage Life, Spring 2014, PDF hosted by UC ANR)
- Gigi Wing Lin, DVM, DACPV — Management of Bumblefoot in Chickens (Today's Veterinary Practice, 2025)
- Ohio State University Extension — Performing a Physical Exam on a Chicken (VME-20, Lossie and McDermott, 2019; hosted by OSU Extension Holmes County)
- Utah State University Extension — Housing Backyard Chickens (David D. Frame, 2008)
- Jacquie Jacob, University of Kentucky (Poultry Extension) — Staphylococcus in Poultry
- University of Wisconsin–Madison Extension — Finding a Veterinarian for your Chickens (Ronald Kean)
- Kansas State University — Veterinary pharmacologist warns that eggs from backyard chickens pose potential consumption problems (FARAD, September 2014)