How to apply a collagen wound dressing, the 6-step protocol

Before you start, what you'll need

Whether you're caring for a parent with a sacral pressure injury, managing your own diabetic foot ulcer, or recovering from Mohs surgery, the supply list is the same. Have all six items ready before you open anything sterile.

• Collagen wound dressing in the right size (see the table below)
• Sterile saline wound wash or a commercial wound cleanser
• Clean nitrile gloves (sterile not required for most home care)
• Sterile gauze pads for patting dry around the wound
• A non-adherent secondary dressing (foam, gauze pad, or transparent film)
• Hypoallergenic medical tape or a stretch wrap to secure

If you're using the Ovena Complete Collagen Care Kit, all six items are in the box. If you're piecing it together yourself, double-check that your saline is unopened, once a saline bottle is opened, the manufacturer typically rates it for 24 hours of use.

Choosing the right size

The correct size leaves about a quarter-inch border of intact periwound skin around the wound edge. Too small and you don't fully cover the bed. Too large and you waste a lot of collagen and risk maceration of the surrounding skin.

• 2"×2", post-Mohs sites, biopsy sites, finger ulcers, small partial-thickness wounds
• 4"×4", most diabetic foot ulcers, mid-sized surgical wounds, post-mastectomy drain sites
• 7"×7", sacral pressure injuries, larger abdominal wounds, donor sites
• Powder, irregular cavities, tunneling wounds, undermining, anywhere a flat sheet won't conform

If you can't decide between two sizes, go up. A 4"×4" sheet trimmed down with sterile scissors covers a 3"×3" wound perfectly fine. A 2"×2" sheet can't be made bigger.

The 6-step application protocol

This is the order wound care nurses actually use in practice. The order matters: rushing step 2 (cleansing) is the most common reason a chronic wound stays stuck.

Step 1, Wash your hands and glove up

Soap and water for a full 20 seconds, dry thoroughly, then put on clean nitrile gloves. If you're caring for someone else's wound, this also protects you from any bacteria in their wound drainage.

Step 2, Cleanse the wound with saline

Irrigate the wound bed with sterile 0.9% saline. Squeeze the bottle to flush debris and old drainage out, don't just dab. Do not use hydrogen peroxide, alcohol, or povidone-iodine on a chronic wound, they kill the healing cells along with the bacteria and have been shown to delay closure (1).

Step 3, Pat the surrounding skin dry

Use a sterile gauze pad to pat the skin around the wound dry. The wound bed itself can, and should, stay slightly moist. Drying the periwound skin is what lets the secondary dressing's adhesive grip properly.

Step 4, Cut the collagen to size

Use clean (or sterile, if available) scissors to trim the collagen sheet so it has about a quarter-inch overlap beyond the wound edge. For very small or irregular wounds, save the trimmings, you can layer them or use them on the next dressing change.

Step 5, Apply collagen directly to the wound bed

Place the sheet onto the wound bed and smooth it down with a sterile cotton-tipped applicator. Full contact with the wound bed matters, air pockets between the collagen and the tissue prevent the matrix metalloproteinase (MMP) binding that makes collagen work. If you're using collagen powder, sprinkle a thin even layer covering the entire bed.

Step 6, Cover with a secondary dressing

The collagen is your primary dressing, it does the work. The secondary dressing keeps the collagen in contact with the wound bed, manages exudate, and protects the area from outside contamination. A non-adherent pad or foam works for most wounds. Secure with hypoallergenic tape or a self-adhering wrap. Change every 1–3 days, see our companion guide on how often to change a collagen dressing.

4 mistakes that ruin a perfectly good dressing

1. Cleansing with hydrogen peroxide. It bleaches the wound clean, and bleaches your healing cells along with it. Use saline.
2. Applying collagen to an infected wound. Collagen creates a moist environment, which makes infections worse, not better. Treat the infection first under clinician guidance (topical or systemic antimicrobials), then resume collagen.
3. Wrapping too tight. A tight wrap restricts blood flow to the wound bed, exactly what you don't want. The wrap should hold the dressing in place, not compress.
4. Changing the dressing every day. Too-frequent changes physically disrupt the new tissue forming under the collagen. Stick to the 1–3 day cadence unless the secondary dressing saturates.

What to expect after application

For the first 24–48 hours, the wound may feel slightly tingly or itchy as inflammation begins to settle. The collagen sheet will slowly turn into a gel as it absorbs wound fluid and binds the MMP enzymes that were stalling healing. By the time you change the dressing, you'll often see the collagen has partially or fully gelled, that's expected and is the sign it's working.

You should not see: sudden increased pain, foul odor, hot or red surrounding skin, or fever. Those are signs of infection, see the When to call a clinician section.

Troubleshooting

The dressing won't stay in place: The secondary dressing isn't tacky enough, or the surrounding skin is too moist. Pat the skin drier and consider a self-adhering wrap.

The collagen sheet keeps lifting at the edges: Lightly mist the sheet with saline before applying so it sticks better to the wet wound bed.

I see pieces of collagen still on the wound at change time: Normal. The collagen is designed to be gradually absorbed. Anything that hasn't been absorbed gets re-applied when you put the new dressing on, don't try to remove it.

The wound looks worse after a few changes: "Worse" can be misleading. Granulation tissue (the new pink/red tissue) often initially looks like the wound has expanded as slough and necrotic tissue lift off. If you're worried, photograph the wound at each change so you can compare objectively, and ask your wound clinician.

When to call a clinician

Frequently asked questions