Neosporin is not the recommended treatment for impetigo. While it contains antibiotics that fight bacteria on the skin’s surface, medical guidelines from the Infectious Diseases Society of America specifically recommend prescription topical antibiotics, either mupirocin or retapamulin, applied twice daily for five days. These prescription options target the bacteria responsible for impetigo far more effectively than over-the-counter alternatives.
Why Neosporin Falls Short
Neosporin contains three antibiotics: neomycin, bacitracin, and polymyxin B. These work well for preventing infection in minor cuts and scrapes, but impetigo is a different situation. It’s an active bacterial infection, typically caused by Staphylococcus aureus or Streptococcus pyogenes, and these bacteria have increasingly developed resistance to the ingredients in over-the-counter antibiotic ointments. Staph bacteria in particular can resist bacitracin, one of Neosporin’s key components.
Prescription options like mupirocin were developed specifically to treat skin infections like impetigo. They penetrate the skin more effectively and concentrate their action against the exact bacteria involved. Using Neosporin instead may reduce some surface bacteria without actually clearing the infection, which can allow it to spread or worsen.
What the Guidelines Recommend
For both the blistering (bullous) and non-blistering (nonbullous) forms of impetigo, the standard treatment is a prescription topical antibiotic applied twice a day for five days. This is a strong recommendation backed by high-quality evidence. The two options your doctor will likely choose between are mupirocin and retapamulin, both available only by prescription.
If the infection covers a large area, involves multiple sores, or is spreading among people in a household or school, oral antibiotics are recommended instead of topical treatment. Oral therapy helps reduce transmission and reaches bacteria that topical ointments can’t.
What Impetigo Looks Like
Impetigo usually starts as red sores or blisters that quickly rupture, ooze for a few days, and then form a honey-colored crust. It most commonly appears around the nose and mouth in children, though it can show up anywhere on the body. The nonbullous form, with its characteristic golden crusts, accounts for the majority of cases. The bullous form produces larger, fluid-filled blisters that are more fragile and tend to last longer before breaking open.
It spreads easily through direct contact with the sores or with items like towels and clothing that have touched them. This is why it tears through daycare centers and schools so quickly.
When Impetigo Gets Serious
Most impetigo clears up without lasting problems when treated properly, but ignoring it or using an ineffective treatment can lead to complications. Cellulitis, a deeper skin infection that spreads into underlying tissue and potentially the bloodstream, is the most concerning risk. A deeper form of impetigo called ecthyma can develop, producing painful ulcers that leave scars after healing.
In rare cases, the strep bacteria behind some impetigo infections can trigger kidney problems. This isn’t caused by the infection spreading to the kidneys directly but by the immune system’s inflammatory response to the bacteria.
Signs that the infection is getting worse include expanding redness around the sores, increasing pain, fever, or sores that keep multiplying despite treatment. Any of these warrant prompt medical attention.
Practical Steps While You Treat It
Before applying any topical antibiotic, gently wash the crusted areas with warm water and mild soap. Soaking a clean cloth in warm water and holding it over the crusts for a few minutes softens them and helps the medication reach the infected skin underneath. Pat dry with a clean towel and apply the prescribed ointment.
Keep the infected areas loosely covered with gauze or a bandage to prevent spreading. Wash your hands thoroughly after touching the sores or applying medication. Use separate towels, washcloths, and bedding for the person with impetigo, and wash these items in hot water daily. Children can typically return to school or daycare 24 to 48 hours after starting antibiotic treatment, once the sores are no longer weeping or can be reliably covered.
If you’ve already been applying Neosporin and the sores aren’t improving after two or three days, that’s a clear sign you need a prescription-strength treatment. Getting the right antibiotic early prevents the infection from spreading to new areas and to other people.