Bacitracin and Neosporin work about equally well at preventing infection in minor wounds, but bacitracin carries a lower risk of allergic reactions. For most people treating a small cut or scrape at home, bacitracin is the safer choice. That said, many dermatologists now recommend skipping both and using plain petroleum jelly instead.
What’s Actually in Each Product
Bacitracin ointment contains a single antibiotic that kills bacteria by disrupting their cell walls. It works primarily against gram-positive bacteria, the group that includes staph and strep, which are the most common culprits in skin infections.
Neosporin is a triple-antibiotic ointment. Each gram contains bacitracin zinc (400 units), neomycin sulfate (3.5 mg), and polymyxin B sulfate (5,000 units). The idea behind combining three antibiotics is broader coverage: bacitracin handles gram-positive bacteria, while polymyxin B targets gram-negative bacteria by breaking apart their outer membranes. Neomycin adds another layer by interfering with bacterial protein production. In theory, this means Neosporin covers more types of bacteria. In practice, the difference rarely matters for minor wounds.
Infection Prevention Is the Same
Clinical trials comparing antibiotic ointments for minor wounds consistently find no meaningful difference in infection rates. A study published in the Journal of the American Academy of Dermatology tested triple-antibiotic ointment, a dual-antibiotic combination, and a petrolatum-based ointment with no antibiotics at all on laser-created wounds treated three times daily for 18 days. No infections occurred in any group, including the non-antibiotic ointment. The researchers concluded that prophylactic antibiotics aren’t necessary for preventing infections in minor clinical wounds.
This finding has been replicated. A separate comparison found that a petrolatum-based skin protectant provided equivalent wound healing to antibiotic ointment across every clinical measure: redness, swelling, crusting, scabbing, and skin regrowth. The reason is straightforward. What actually promotes healing in these ointments is the petrolatum base, which creates a moist barrier over the wound. Both bacitracin and Neosporin share that same petrolatum base, so both keep the wound environment moist. The antibiotics themselves add little to nothing for a clean, minor wound.
Neosporin’s Allergy Problem
This is where the two products diverge. Neomycin, the ingredient unique to Neosporin, is one of the most common causes of allergic contact dermatitis. A large meta-analysis found that about 3.2% of adults and 4.3% of children with dermatitis tested positive for neomycin allergy through patch testing. The rates are highest in North America, where 6.4% of adults and 8.1% of children showed sensitivity.
An allergic reaction to neomycin looks a lot like a worsening wound: redness, itching, swelling, and sometimes a rash spreading beyond the wound edges. People often assume their cut is getting infected and apply more Neosporin, which makes things worse. The American Academy of Dermatology explicitly advises against antibiotic ointments after skin procedures, stating that the risk of an allergic reaction to the ointment is greater than the risk of infection. Their guidance is to use petroleum jelly instead, and to stop any antibiotic ointment immediately if redness or irritation develops.
Bacitracin can also cause allergic reactions, but it happens far less frequently than with neomycin. By choosing bacitracin over Neosporin, you eliminate the most common allergen from the equation entirely.
The Pain Relief Factor
Neosporin sells a “Plus Pain Relief” version that includes pramoxine, a topical numbing agent at 10 mg per gram. Standard bacitracin ointment doesn’t contain any pain reliever. If you’re dealing with a scrape that stings, the Neosporin Pain Relief variant offers a mild numbing effect that plain bacitracin won’t provide. This is genuinely the one area where a Neosporin product offers something bacitracin doesn’t, though you could also apply a separate topical pain reliever if needed.
Bacterial Resistance Concerns
Neither product is immune to the growing problem of antibiotic resistance. Research has found that resistance rates to bacitracin in Staphylococcus aureus, the bacterium most likely to infect a skin wound, have reached as high as 100% in some studies across human and animal samples. S. aureus can be readily induced to develop high-level bacitracin resistance when exposed to the antibiotic. This is one more reason dermatologists increasingly lean toward recommending petroleum jelly for minor wounds: it keeps the wound moist without contributing to resistance.
What Dermatologists Actually Recommend
The trend in wound care has shifted away from over-the-counter antibiotic ointments altogether. The American Academy of Dermatology recommends plain petroleum jelly for post-procedure wound care, not bacitracin, not Neosporin. The reasoning is simple: petroleum jelly provides the same moist healing environment, carries no allergy risk, doesn’t contribute to antibiotic resistance, and costs less.
If you still prefer using an antibiotic ointment for minor cuts and scrapes, bacitracin is the better option over Neosporin. It provides comparable protection with a lower chance of allergic reaction and one fewer unnecessary antibiotic. But for a clean wound that you’re rinsing with water and covering with a bandage, petroleum jelly does the job just as well as either product. Whichever you choose, limit use to one week. Anything deeper than a superficial cut, any animal bite, or any wound showing signs of true infection (spreading redness, warmth, pus, or fever) needs professional evaluation rather than over-the-counter ointment.