Cellulitis on the legs is treated with oral antibiotics, typically for five days, combined with leg elevation and basic wound care at home. Most people notice improvement within a few days of starting treatment, though full healing often takes longer. The legs are the most common site for cellulitis because small skin breaks, cracked feet, and swelling give bacteria an easy entry point.
What Happens During Cellulitis
Cellulitis is a bacterial infection of the deeper layers of skin and the tissue just beneath it. On the legs, it usually starts when bacteria (most often strep or staph) enter through a crack, cut, insect bite, or patch of dry skin. The infected area becomes red, warm, swollen, and painful. The redness often spreads outward over hours or days if untreated.
Unlike a surface wound infection, cellulitis sits deeper in the tissue, which is why topical antibiotic creams won’t reach it. You need oral antibiotics that travel through your bloodstream to the infected tissue.
Antibiotic Treatment
For uncomplicated leg cellulitis without signs of a drug-resistant infection, doctors typically prescribe one of a few standard antibiotics: cephalexin, dicloxacillin, or cefadroxil. These target the strep and staph bacteria responsible for most cases. The CDC recommends a five-day course for most cellulitis. If the infection hasn’t improved by day five, your doctor may extend treatment or switch antibiotics.
When there’s a visible abscess or pus draining from the site, MRSA (methicillin-resistant staph) becomes more likely. In those cases, doctors choose different antibiotics that cover resistant bacteria, such as trimethoprim-sulfamethoxazole, doxycycline, or clindamycin. Your doctor may also drain the abscess if one is present.
Take the full course even if the redness starts fading. Stopping early lets surviving bacteria regroup.
What You Can Do at Home
Leg elevation is one of the most effective things you can do alongside antibiotics. Prop your leg on pillows so the infected area sits above the level of your heart. This reduces swelling and pain by helping fluid drain away from the inflamed tissue. Do this as often as possible throughout the day, not just at bedtime.
Over-the-counter pain relievers like ibuprofen or acetaminophen can help manage pain and bring down swelling. Keep the skin clean, and if there’s a wound at the entry site, cover it with a clean bandage. Avoid tight clothing or compression stockings on the infected area until the acute infection clears, as they can increase discomfort.
Drawing a line around the edge of the redness with a pen is a simple but useful trick. It lets you track whether the infection is spreading or shrinking over the next 24 to 48 hours, which is critical information for knowing whether your antibiotics are working.
Recovery Timeline
Most people start feeling better within two to three days of beginning antibiotics. The pain and warmth tend to ease first, while redness and swelling take longer to resolve. A study of 247 people with mild to moderate leg cellulitis found that by day 10, swelling had decreased by about 50% and the affected area had shrunk by roughly 55%. That means even after finishing a full antibiotic course, your leg may still look somewhat red or swollen. This is normal and doesn’t necessarily mean the antibiotics failed.
It’s common for residual redness and mild swelling to linger for days or even a couple of weeks after the infection itself is cleared. The key signs that treatment is working are that the redness stops spreading, the pain decreases, and any fever resolves. If the infection is still expanding 48 to 72 hours after starting antibiotics, contact your doctor.
When Cellulitis Needs Hospital Care
Most leg cellulitis can be treated at home with oral antibiotics. But certain situations require intravenous antibiotics in a hospital or outpatient infusion center. Doctors grade cellulitis severity on a scale from Class I to IV:
- Class I: No fever or other systemic symptoms, no complicating health conditions. This is treated at home.
- Class II: You’re feeling systemically unwell (fever, chills, nausea) or you have a condition like diabetes or obesity that complicates healing. This may still be managed as an outpatient but needs closer monitoring.
- Class III: Marked illness with confusion, rapid heart rate, or low blood pressure. This requires hospital admission.
- Class IV: Signs of sepsis or a life-threatening deep infection. This is a medical emergency.
People with weakened immune systems, poorly controlled diabetes, or significant swelling in the legs (lymphedema) are more likely to need escalated care.
Red Flags That Need Emergency Attention
The most dangerous condition that can mimic cellulitis is necrotizing fasciitis, a rapidly progressing infection that destroys tissue beneath the skin. It’s rare, but missing it can be fatal. The CDC identifies several warning signs that should raise suspicion:
- Pain out of proportion: The pain feels far worse than what the visible redness would suggest.
- Skin changes: Dark or purplish patches, blisters (bullae), or areas of skin that look dead or blackened.
- Numbness: Areas of decreased sensation in or around the infection.
- Crepitus: A crackling or popping feeling under the skin when you press on it, caused by gas produced by bacteria in the tissue.
- Severe systemic illness: High fever, confusion, rapid heart rate, or low blood pressure that seems disproportionate to what the skin looks like.
If any of these are present, go to an emergency room immediately. Necrotizing fasciitis progresses in hours, not days.
Preventing Cellulitis From Coming Back
Leg cellulitis has a frustratingly high recurrence rate, especially if the conditions that caused the first episode haven’t changed. The American Academy of Dermatology identifies several practical steps that meaningfully reduce repeat infections.
Treat athlete’s foot immediately. Fungal infections between the toes create tiny cracks in the skin that are invisible highways for bacteria. Check your feet daily, especially between the toes, and treat any itching, peeling, or cracking with antifungal cream. Keep your skin moisturized to prevent the dry, cracked skin that invites bacteria. This is particularly important on the lower legs and feet, where skin tends to be driest.
If you have lymphedema (chronic swelling in the legs), managing it is the single most impactful thing you can do. Lymphedema is the strongest risk factor for recurrent cellulitis. Treatment involves compression bandages, elevation, exercise, and sometimes manual lymphatic drainage.
Other conditions that raise your risk include diabetes, eczema, leg ulcers, and peripheral artery disease. Keeping these well managed reduces the chances of another episode. Losing weight, if you’re overweight, also lowers recurrence risk according to research.
For people who develop cellulitis three or four times in a single year, doctors may recommend a daily low-dose antibiotic taken long-term as a preventive measure. This is typically reserved for people who’ve exhausted other prevention strategies, since long-term antibiotic use carries its own risks.