Cellulitis and Leg Ulcers in Seniors: Warning Signs, Treatment and How to Stop Them Coming Back
Cellulitis is a bacterial skin infection that makes skin red, swollen, warm and painful. It most often affects the feet and legs. The CDC says to seek care right away if the red area spreads quickly or you get a fever or chills (CDC).
Older adults face a higher risk because of leg swelling, slow-healing leg ulcers, diabetes and thin skin. This guide covers the warning signs, treatment and the habits that help stop it from coming back.
What cellulitis looks like
The CDC and MedlinePlus list these signs (MedlinePlus):
- Red, swollen skin that is warm and tender or painful
- Skin that looks tight and glossy, or pitted like an orange peel
- Blisters in some cases
- Fever and chills
- Redness that can grow quickly in the first 24 hours
Other problems, like fluid buildup or skin irritation from poor circulation, can look similar. That’s one more reason to have a provider look at it.
When to get care right away
Contact your provider right away if you have signs of cellulitis. Get care urgently if:
- The red area spreads quickly
- You have a fever or chills
- You’re being treated and develop persistent fever, drowsiness, blisters or red streaks that spread
- The redness grows past the pen line your provider drew
Untreated cellulitis can spread to the blood, heart valves, bones or joints, the CDC warns. These are serious and need fast treatment.
How it’s diagnosed and treated
Doctors usually diagnose cellulitis by looking at the skin. Your provider may draw a line with a pen around the edge of the redness. That makes it easy to see if it spreads over the next few days.
Treatment:
- Antibiotic pills treat most cases. Cellulitis usually goes away after 7 to 10 days of antibiotics, per MedlinePlus. Some people need longer.
- IV antibiotics in the hospital may be needed if you’re very sick, getting worse on pills, have a weak immune system or have an infection around your eyes.
- Raise the leg above your heart when you can. The CDC lists this as part of treatment.
Finish the full course your doctor prescribes, even if your leg looks better in a few days.
Why older adults are at higher risk
The CDC and MedlinePlus list these risk factors:
- Chronic swelling (edema) or lymphedema in the legs
- Leg ulcers and other open wounds
- Athlete’s foot and cracked skin between the toes
- Diabetes and poor circulation
- Eczema or shingles
- Being overweight
- A past leg vein harvest for heart bypass surgery
- Steroid medicines that weaken the immune system
Repeat infections: The CDC says people with several cellulitis infections below the knee should be checked for a fungal infection of the feet. MedlinePlus notes that cracks from foot fungus let bacteria in, especially in people with diabetes.
Leg ulcers: the open-door problem
A venous ulcer is an open sore that forms when leg veins don’t push blood back to the heart well. Pressure builds, fluid leaks into the skin and tissue breaks down (MedlinePlus).
Key facts:
- Most venous ulcers form on the leg, above the ankle.
- They can be slow to heal.
- Early warning signs include itchy, thin skin with light red color (called stasis dermatitis), leg swelling and heaviness, cramping and dark red, purple or brown hardened skin.
- An ulcer is a shallow sore with a red base, sometimes covered with yellow tissue, with uneven edges.
- An infected ulcer may smell bad or drain pus.
Risk factors include varicose veins, a past blood clot in the leg, blocked lymph vessels, older age, being female, being tall, obesity, smoking and sitting or standing for long periods.
Caring for a venous ulcer
MedlinePlus lists these steps:
- Keep the wound clean and covered as your provider shows you.
- Keep the skin around it dry and moisturized, but don’t soak healthy skin.
- Wear compression stockings or bandages every day as instructed. They reduce swelling, help healing and ease pain.
- Raise your feet above your heart as often as you can, like lying down with pillows under your legs.
- Walk or move every day to help blood flow.
If an ulcer won’t heal, your provider may suggest a procedure to improve blood flow.
How to prevent cellulitis from coming back
- Check your feet and legs daily for cuts, cracks or redness. Use a mirror if needed.
- Treat athlete’s foot right away.
- Moisturize dry skin to prevent cracks, as MedlinePlus advises.
- Wear shoes that fit well, and don’t walk barefoot outside.
- Control swelling with compression and leg raising. Our guide to edema in seniors explains the causes.
- Manage blood sugar if you have diabetes. See our diabetes guide for older adults.
- Get foot care if you can’t safely trim your nails. Our post on Medicare and podiatry explains when Part B pays.
What Medicare covers
Original Medicare Part B covers doctor visits, tests and outpatient care for cellulitis and wound care. You pay 20% of the Medicare-approved amount after the $283 Part B deductible in 2026. Part D covers antibiotic pills, and Part A covers a hospital stay.
Two other items help many people:
- Surgical dressings. Part B covers medically needed care for a surgical or surgically treated wound. You pay 20% after the deductible (Medicare.gov).
- Lymphedema compression items. If you have lymphedema and your doctor orders them, Part B covers compression garments, wraps with adjustable straps and bandaging supplies. You pay 20% after the deductible (Medicare.gov).
Compression stockings for other reasons are covered only in limited cases. Our guide to Medicare and compression stockings explains the two cases where they are.
Common questions
What does cellulitis on the leg look like?
Red, swollen, warm and painful skin, often on one lower leg. The skin may look tight and glossy, and some people get blisters, fever or chills.
When is cellulitis an emergency?
Get care right away if the redness spreads quickly, you have fever or chills, or you develop drowsiness, blisters or red streaks while on antibiotics.
How long does cellulitis take to heal?
It usually clears after 7 to 10 days of antibiotics. More severe cases, or people with chronic illness or weak immune systems, may need longer treatment.
Why does my cellulitis keep coming back?
Common reasons are leg swelling, leg ulcers and foot fungus that cracks the skin. The CDC advises checking for a fungal foot infection if you have repeat infections below the knee.
Does Medicare cover compression for leg ulcers?
Part B covers compression items if you have lymphedema and a doctor’s order, and it covers surgical dressings for qualifying wounds. You pay 20% after the deductible.
Written by Khasim Basha Shaik. I research and compare health and Medicare topics for readers. I am not a licensed doctor, nurse or other medical professional. This article summarizes CDC, MedlinePlus and Medicare.gov materials and is not medical advice. Last reviewed October 19, 2026.
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