Never Ignore Small Wounds: You Might End Up With a Bone-Deep Infection

Medical Disclaimer: This article is intended for general educational purposes only and does not constitute medical advice. It is not a substitute for professional medical evaluation, diagnosis, or treatment. Always consult your physician or a qualified healthcare provider with any questions you have regarding a medical condition. If you believe you have a medical emergency, call 911 or go to your nearest emergency room immediately.

It starts small. A blister from a new pair of shoes. A scratch from the garden. A minor cut on the foot that didn’t quite stop bleeding. You clean it, maybe put a bandage on it, and forget about it.

A week later, the skin around it is red and warm. Two weeks later, the redness has spread. And then — for some people — what began as something barely worth noticing becomes a hospital admission, an IV antibiotic drip, and a conversation about bone infection.

As a hospitalist, I have seen this happen more times than I can count. Small wounds that were ignored, or undertreated, or simply not noticed — especially in people who had reduced sensation in their feet — that progressed to serious, limb-threatening infections. Osteomyelitis. Sepsis. Surgery.

This article is not meant to frighten you. It is meant to give you the information you need to take small wounds seriously before they become big problems.

What Is a Wound Infection and How Does It Happen?

Our skin is our body’s first and most important barrier against infection. When that barrier is broken — by a cut, a blister, an ulcer, a puncture, or even a small abrasion — bacteria that normally live harmlessly on the skin surface can gain access to the deeper tissues beneath.

In a healthy person with good circulation and an intact immune system, the body typically handles minor breaks in the skin efficiently. White blood cells rush to the site, contain the bacteria, and the wound heals without incident.

But when conditions are not ideal — when circulation is reduced, when the immune system is compromised, when the wound is deep or contaminated, or when bacteria are particularly aggressive — that containment can fail. The infection spreads. And once it reaches bone, it becomes a condition called osteomyelitis, which is significantly harder to treat and carries a risk of long-term complications including bone loss and chronic infection.

Who Is Most at Risk?

While anyone can develop a wound infection, certain conditions make serious infections far more likely:

Diabetes. This is one of the most important risk factors. Elevated blood sugar impairs immune function and damages nerves and blood vessels over time. People with diabetic neuropathy (nerve damage) may not feel pain in their feet — meaning a wound can go unnoticed for days or weeks. Reduced circulation in the lower extremities also slows healing and limits the immune response. Diabetic foot infections are one of the leading causes of non-traumatic lower limb amputation in the United States.

Peripheral arterial disease. When blood flow to the extremities is reduced due to narrowed arteries, wounds in the legs and feet heal poorly and are at high risk for infection and non-healing ulcers.

Chronic venous insufficiency. Poor venous circulation can lead to skin changes and ulcers on the lower legs that are vulnerable to infection.

Immunosuppression. This includes people on chemotherapy, long-term steroid use, medications for autoimmune conditions, or living with conditions that affect immune function. When the immune system cannot respond fully, even routine bacteria can cause serious infection.

Obesity. Impairs circulation, wound healing, and immune response, and increases the depth of tissue at risk.

Advanced age. Immune function and skin integrity both decline with age, making older adults more susceptible to wound complications.

Prior history of wound infections or ulcers. A history of skin breakdown in a particular area suggests that tissue in that area is vulnerable.

If any of these apply to you, every wound — no matter how small — deserves careful attention and prompt evaluation.

What Does a Normal Wound Look Like — and When Should You Worry?

A wound that is healing normally will show gradual improvement over days. Some redness and mild warmth directly at the wound edge in the first 24–48 hours is expected — this is part of the normal inflammatory healing process.

Signs that a wound may be infected and requires medical attention:

• Redness that is spreading beyond the wound edges — especially if you can watch it expand over hours

• Increasing warmth or swelling around the wound

• Pain that is worsening rather than improving, or new pain in a wound that was previously painless

• Discharge that is thick, yellow, green, or has an odor

• Red streaks extending from the wound (this can indicate that infection is spreading through the lymphatic system — seek care urgently)

• Fever, chills, or feeling unwell — these suggest the infection may be entering the bloodstream

• A wound that is not improving after 7–10 days of basic wound care

• Wound edges that are pulling apart or appear dark or discolored

Signs that require emergency care — go to the ER or call 911:

• Rapidly spreading redness covering a large area

• Red streaks moving up the arm or leg

• High fever with a wound that looks infected

• Severe pain out of proportion to the appearance of the wound (this can be a sign of a rare but life-threatening infection of the deeper tissues)

• Any signs of confusion, rapid heart rate, or feeling seriously unwell alongside a wound

What Is Osteomyelitis?

Osteomyelitis is an infection of the bone. It can occur when a skin or soft tissue infection spreads downward through the tissue layers and eventually reaches the bone beneath — a process that is particularly common with wounds over bony prominences like the heel, ankle, toe, or shin.

It can also occur when bacteria travel through the bloodstream from another site of infection and seed the bone — a process called hematogenous osteomyelitis.

Bone infections are serious for several reasons. Bone has a limited blood supply compared to soft tissue, which makes it harder for the immune system — and antibiotics — to reach the site of infection. Once established, osteomyelitis often requires weeks of intravenous antibiotics, and in some cases, surgical debridement or removal of infected bone tissue.

Diagnosing osteomyelitis typically involves imaging — an MRI is the most sensitive study — along with blood tests and sometimes a bone biopsy to identify the specific bacteria causing the infection.

Treatment depends on the severity and the specific bacteria involved, but almost always involves a prolonged course of antibiotics and close follow-up with specialists.

Basic Wound Care — What to Do at Home

For minor wounds in healthy individuals, proper home wound care can prevent most infections from developing:

Clean the wound promptly and thoroughly. Rinse with clean running water for several minutes to remove dirt, debris, and bacteria. Mild soap around — not in — the wound is appropriate. Avoid hydrogen peroxide or iodine directly in the wound, as these can damage healing tissue.

Apply a thin layer of antibiotic ointment such as bacitracin or triple antibiotic ointment to the wound surface. This helps prevent bacterial growth and keeps the wound moist, which supports healing.

Cover the wound with a clean bandage. Change the dressing daily or whenever it becomes wet or soiled. Keep the wound covered until a protective layer of new skin has formed.

Watch for signs of infection daily. Check the wound and the surrounding skin each time you change the dressing. Early detection of infection is the key to early treatment.

Avoid soaking the wound in baths, pools, or the ocean until it is fully healed. Moisture and contaminated water introduce bacteria.

For wounds on the feet, keep weight off the area if possible, and check carefully if you have any reduced sensation.

When to See a Doctor

See a doctor — not tomorrow, today — if:

• You have diabetes, poor circulation, or a weakened immune system and you have any wound on your feet or legs

• The wound is deep, ragged, or contaminated with soil or debris

• You cannot adequately clean the wound at home

• There are any signs of infection as described above

• The wound involves a joint, tendon, or bone

• You have not had a tetanus booster in the past five years and the wound was caused by something dirty or rusty

• The wound is on your face or hands, where complications carry additional consequences

• You are simply unsure — when in doubt, get it checked

There is no such thing as a wound too minor to ask a doctor about. The cost of a clinic visit is immeasurably lower than the cost of a hospitalization for a bone infection.

The Bottom Line

Small wounds become serious infections when they are ignored, undertreated, or not recognized in time. The people most at risk are often the ones least likely to feel pain from a wound — which is precisely why intentional daily wound checks are so important for anyone with diabetes or reduced sensation in their feet.

Look at your feet every day. Wash and dry between your toes. Wear properly fitting shoes. And if something doesn’t look right — get it evaluated.

Your body is worth the extra five minutes of attention.

— Dr. Joyce Cheng, MD, MPH, MHA, FACP, Internal Medicine Hospitalist | Clinical Assistant Professor

This article is for general educational purposes only. It does not constitute medical advice and should not replace consultation with your personal physician. If you have concerns about a wound or your health, please contact your healthcare provider.