Cellulitis

Overview

Cellulitis is a common bacterial infection of the deeper layers of the skin and the tissue just beneath it. It usually develops when bacteria enter through a break in the skin, even a small cut, scrape, insect bite, or area of irritated skin. Cellulitis can occur anywhere on the body, but it most often affects the lower legs. It may also appear on the face, arms, hands, or around surgical wounds.

Although cellulitis is usually treatable, it can become serious if the infection spreads. Early medical assessment is important, especially if the affected area is expanding, painful, or accompanied by fever. Cellulitis is different from simple skin redness or a rash because it involves infection beneath the skin and may require prescribed medical treatment.

Symptoms

Symptoms of cellulitis often develop in one area of the skin and may worsen over hours or days. The affected area may feel warm, tender, swollen, and painful. The skin may look red or darker than the surrounding skin, depending on skin tone.

• Redness, discoloration, or inflammation in a patch of skin
• Swelling and tightness of the skin
• Warmth and tenderness in the affected area
• Pain or sensitivity when touched
• Skin that appears stretched, shiny, or thickened
• Fever, chills, tiredness, or feeling generally unwell
• Blisters, skin dimpling, or fluid leakage in more severe cases
• Swollen lymph nodes near the affected area

In some cases, red streaks may appear extending from the infected area. This can be a sign that the infection is spreading through the lymphatic system and needs prompt medical attention.

Causes and Risk Factors

Cellulitis is usually caused by bacteria that normally live on the skin or in the environment. These bacteria can enter the body through a break in the skin barrier. Sometimes the opening is obvious, such as a wound or ulcer, but in other cases it may be very small and hard to notice.

Common entry points include cuts, cracks between the toes, eczema or other irritated skin conditions, insect bites, burns, surgical incisions, and areas affected by poor circulation or swelling.

• Previous episodes of cellulitis
• Skin injuries, ulcers, or chronic wounds
• Swelling of the legs or arms, including lymphedema
• Conditions that affect circulation
• Diabetes or other conditions that may affect healing or immune response
• Weakened immune system
• Skin conditions that cause cracking, scratching, or inflammation
• Recent surgery or injury
• Being overweight, which may increase skin folds and swelling

Cellulitis itself is not usually spread from person to person through casual contact. However, the bacteria that can cause skin infections may spread in certain situations, especially if there is direct contact with open wounds or contaminated surfaces.

Diagnosis

A healthcare professional usually evaluates cellulitis by examining the skin and asking about symptoms, recent injuries, medical history, and any previous skin infections. The appearance, warmth, tenderness, and rate of spread of the affected area can help guide the assessment.

In many cases, no special test is needed to suspect cellulitis. However, additional tests may be recommended if the infection is severe, keeps returning, is not improving as expected, or if another condition needs to be ruled out. These may include blood tests, a sample from an open wound, or imaging studies if there is concern about a deeper infection, abscess, blood clot, or another medical problem.

Because other conditions can look similar to cellulitis, such as allergic reactions, eczema, inflammation from poor circulation, or blood clots, medical evaluation is important for an accurate assessment and appropriate care plan.

Treatment Options

Treatment depends on the location and severity of the infection, the person’s overall health, and whether there are signs that the infection is spreading. Cellulitis is commonly treated with prescribed antibacterial medication. The type, route, and duration of treatment are determined by a healthcare professional.

Mild cases may be managed with treatment at home under medical guidance. More serious cases may require care in a hospital, especially if there is high fever, rapid spread, severe pain, infection near the eye, a weakened immune system, or difficulty taking medication by mouth.

Supportive care may include rest and measures to reduce swelling, depending on the affected area and the doctor’s advice. If there is an abscess or collection of pus, a medical procedure may be needed to drain it. Ongoing care may also focus on treating the cause of skin breaks, such as athlete’s foot, eczema, leg swelling, or chronic wounds, to reduce the risk of recurrence.

It is important to follow the healthcare provider’s instructions and attend follow-up appointments if recommended. Stopping prescribed treatment early or delaying medical care may allow the infection to worsen or return.

When to See a Doctor

Seek medical advice promptly if you notice a red, swollen, warm, or painful area of skin, especially if it is spreading or you feel unwell. Early assessment is particularly important for people with diabetes, circulation problems, chronic swelling, a weakened immune system, or a history of recurrent cellulitis.

Urgent medical attention is needed if there is fever, chills, confusion, dizziness, rapid worsening, severe pain, red streaks from the affected area, numbness, blackened skin, or cellulitis involving the face or area around the eye. These signs may indicate a more serious infection or complications that require immediate care.

Cellulitis can often be treated effectively when addressed early. If you are unsure whether a skin change is minor irritation or infection, it is safest to contact a healthcare professional for guidance.