Should You Put Neosporin on a Wound?

Why dermatologists say no

Neosporin is a triple antibiotic ointment: neomycin, bacitracin, and polymyxin B. Two of the three are notorious in dermatology. Neomycin and bacitracin rank among the most common causes of allergic contact dermatitis in the United States — each has been named Allergen of the Year by the American Contact Dermatitis Society (bacitracin in 2003, neomycin in 2010), a designation created to draw attention to allergens doing outsized harm.

The allergy does not always show up the first time. Sensitivity builds with repeated exposure — so an ointment that seemed fine for years can one day produce a red, itchy, weeping rash exactly where you applied it.

The rash that looks like an infection

Here is the part that causes real trouble. An allergic reaction to the ointment looks a great deal like a wound infection: the skin around the wound turns red, itches, weeps, and seems to be getting worse. The natural response is to apply more Neosporin — which feeds the reaction it is causing.

That cycle sends people to urgent care, and some end up taking oral antibiotics for an infection they never had. Stopping the ointment is often the entire treatment.

What the research shows

This is not just opinion. A randomized controlled trial of 922 ambulatory surgery patients, published in JAMA, compared white petrolatum against bacitracin ointment on healing surgical wounds. Infection rates were statistically no different between the two — and the allergic reactions occurred only in the antibiotic group. The full citation appears below.

For a clean wound, the antibiotic is risk without benefit. What a healing wound actually needs is simpler: keep it moist, keep it covered, keep it clean.

What to do instead

For everyday cuts, scrapes, and healing surgical wounds, the routine dermatologists recommend is short:

• Wash the area gently with mild soap and water. No peroxide, no alcohol — both damage healing tissue.
• Apply a thin layer of plain petrolatum (plain Vaseline). Check the label: petrolatum only, no added antibiotics or fragrances.
• Cover with a nonstick bandage, and change it daily or when wet.
• Repeat until healed. A moist, covered wound heals more comfortably and with less crusting than one left open to scab.

When to call a doctor

Most wounds heal without drama. Call your physician if you notice any of the following:

• Redness that spreads beyond the edge of the wound
• Pain that increases after the first two to three days instead of easing
• Pus or cloudy drainage
• Fever
• A sore that simply will not heal over several weeks — some skin cancers first appear as a small wound that never quite closes, and that deserves a professional look