Polysporin and Neosporin are not the same product. They share two identical antibiotics, but Neosporin adds a third, neomycin, which broadens its bacterial coverage while also raising the risk of allergic skin reactions. For most minor cuts and scrapes, the two perform similarly, and the practical difference comes down to how your skin tolerates that extra ingredient.
What’s in Each Product
Polysporin contains two antibiotics: bacitracin zinc and polymyxin B sulfate. Neosporin contains those same two plus neomycin sulfate. That’s the only formula difference between the standard versions of each brand. Both come as ointments you apply directly to minor wounds.
Each antibiotic targets a different category of bacteria. Bacitracin handles most gram-positive bacteria, the group that includes staph and strep species commonly found on skin. Polymyxin B covers gram-negative bacteria, a category bacitracin mostly misses. Neomycin also targets gram-negative bacteria, so Neosporin’s triple-antibiotic formula provides somewhat broader coverage against that group. In practice, though, the wounds you’d treat at home with either product are typically caused by the same common skin bacteria, and the two-antibiotic combination in Polysporin handles those effectively.
The Neomycin Allergy Problem
The biggest practical reason to choose between these products is neomycin sensitivity. In a study of over 1,100 patients tested for contact allergies, 6% reacted to neomycin. That makes it one of the more common causes of allergic contact dermatitis from topical medications. The reaction typically shows up as redness, itching, and swelling around the wound, which people often mistake for an infection getting worse. They apply more ointment, which makes the reaction worse still.
If you’ve ever noticed a wound looking more irritated after applying Neosporin, or if your skin around the area became red and itchy in a way that didn’t match an infection, neomycin allergy is a likely explanation. Switching to Polysporin usually resolves the problem, since it contains the same base antibiotics without neomycin.
Do They Actually Speed Healing?
The assumption behind reaching for either product is that killing bacteria on a wound helps it heal faster. The evidence on that is more complicated than you’d expect. A Johns Hopkins Medicine study tracked adults who either applied or skipped topical antibiotics on their everyday cuts and scrapes over 10 months. The majority of participants who used antibiotics experienced slower healing than those who didn’t. The researchers found that normal levels of skin bacteria, and even mild infections the body could fight off on its own, actually improved the healing process.
This doesn’t mean antibiotic ointments are useless. They can still help prevent infection in wounds that are dirty or in areas prone to contamination. But for a clean, minor cut that you’ve rinsed with water, the ointment may matter less than simply keeping the wound moist and covered. Plain petroleum jelly does a good job of that without any antibiotic ingredients at all.
Where Not to Use Either Product
Both Polysporin and Neosporin are formulated for intact skin only. Don’t put either one in your eyes. Don’t use them inside your ear canal if you have a perforated eardrum, since the antibiotics can reach inner ear structures and cause damage. Deep puncture wounds, animal bites, and burns larger than a small patch also fall outside what these over-the-counter ointments are designed for.
Which One to Choose
For most people treating a minor scrape, cut, or small burn at home, Polysporin and Neosporin will perform about the same. The two shared antibiotics cover the bacteria most likely to cause trouble on your skin. Neosporin’s extra ingredient adds marginally broader coverage but also adds the most common source of allergic reactions in topical antibiotics.
If you’ve never had a reaction to either product, both are reasonable choices. If you notice any irritation or worsening redness after applying Neosporin, try Polysporin instead. And if you want to skip the antibiotics entirely, keeping a wound clean, moist with petroleum jelly, and covered with a bandage is a well-supported approach for minor injuries that aren’t visibly dirty or contaminated.