You should keep a skin biopsy site covered with a bandage until the wound has fully closed, which typically takes one to two weeks depending on where on your body the biopsy was done. The initial bandage placed by your doctor usually stays on for 24 to 48 hours, after which you begin a daily routine of cleaning the site, applying petroleum jelly, and covering it with a fresh bandage.
The First 24 to 48 Hours
Leave the original bandage your doctor applied in place for at least 24 hours. This gives the wound time to begin clotting and protects it during the most vulnerable period. Some offices will tell you to leave it on for a full 48 hours, so follow whatever specific instructions you were given. During this window, avoid bumping the site or doing anything that stretches the surrounding skin, which can cause bleeding or widen the wound.
Daily Bandage Changes After That
Once you remove the first bandage, you’ll switch to a daily cycle: gently wash the area with mild soap and water, pat it dry, apply a thin layer of plain petroleum jelly, and cover it with a clean adhesive bandage. You repeat this once or twice a day until the wound closes.
Plain petroleum jelly is the standard recommendation. It keeps the wound moist, which promotes faster healing and reduces scarring. Many people assume they need an antibiotic ointment, but petroleum jelly works just as well for preventing infection and carries no risk of causing an allergic skin reaction, which antibiotic ointments sometimes do.
How Long Until You Can Leave It Uncovered
The total time you need to keep the site bandaged depends on the type of biopsy and where it was performed. A shave biopsy, which removes only the surface layers of skin, generally heals faster than a punch biopsy, which goes deeper and sometimes requires stitches.
If your biopsy site has stitches, you’ll keep it covered until the stitches come out. The removal timeline varies by location:
- Face: 3 to 5 days
- Chest, abdomen, arms, and scalp: 7 to 10 days
- Back and legs: 12 to 20 days
Skin on the face has a rich blood supply and heals quickly, which is why those stitches come out earliest. The back and legs heal more slowly because they experience more tension and movement throughout the day. Even after stitches are removed, your doctor may apply adhesive strips to reduce tension on the wound for several more days.
If your biopsy didn’t require stitches, you’ll typically keep up the bandage routine for about one to two weeks, until a solid scab has formed or the skin has closed over completely. Once the surface is sealed, air exposure actually helps at that point, and you can stop covering it.
Showering and Water Exposure
Brief showers are fine once you’ve removed the initial bandage, as long as you avoid directing the stream of water right onto the wound. Pat the area dry gently afterward and reapply petroleum jelly and a fresh bandage.
Soaking the wound is a different story. Stay out of bathtubs, swimming pools, and hot tubs until the wound has healed, usually about seven days at minimum. Prolonged water exposure softens the tissue, can dissolve the clot, and introduces bacteria. This applies to any body of water where the biopsy site would be submerged.
Activity Restrictions While Healing
Avoid activities that stretch or pull the skin near the biopsy site. This is especially important for biopsies on joints, the back, or the chest, where everyday movements already create tension. Stretching the wound can reopen it, cause more bleeding, and lead to a larger scar. Light daily activity is usually fine, but hold off on intense exercise that engages the area until the wound has closed or your stitches are out.
Managing Pain
Most biopsy sites cause only mild soreness. Acetaminophen (Tylenol) is the recommended option for discomfort. Avoid aspirin, ibuprofen, and other anti-inflammatory pain relievers for at least 24 hours after the procedure, as they thin the blood and can increase bleeding at the site.
Signs of Infection to Watch For
Some redness and mild swelling right around the biopsy site is normal during the first few days. What isn’t normal is redness that spreads outward from the wound, increasing pain after the first day or two, warmth or swelling that gets worse rather than better, pus or cloudy drainage, or a fever. These signs can appear anywhere from two to seven days after the procedure and suggest the wound may be infected. If you notice any of them, contact your doctor’s office rather than waiting it out.