Identifying Skin Infections

Healthy skin acts as a protective barrier. When that barrier is disrupted — through cuts, shaving, insect bites, eczema, acne, or chronic skin conditions — microorganisms can enter and multiply.

Skin infections are most commonly:

• Bacterial (such as cellulitis or abscess)

• Fungal (such as tinea infections)

• Viral (such as herpes simplex or shingles)

Identifying the likely cause helps guide proper treatment, since antibiotics are not effective for viral or fungal infections.

Infected skin often becomes:

• Red and progressively expanding

• Warm to the touch

• Swollen

• Tender or painful

Additional signs may include drainage, crusting, or the development of a fluid-filled or pus-filled area.

A key diagnostic feature in current practice is progression. Irritated skin typically stabilizes or improves. Infected skin tends to worsen over 24–72 hours.

Bacterial infections are frequently caused by Staphylococcus aureus (including community-acquired MRSA) or Streptococcus species.

Common presentations include:

• Cellulitis – diffuse redness, warmth, swelling without clear borders

• Abscess – localized collection of pus, often fluctuant and painful

• Impetigo – superficial crusted lesions, more common in children

Current Standard of Care

• Mild cellulitis without systemic symptoms may be treated with oral antibiotics.

• Abscesses often require incision and drainage; antibiotics may or may not be needed depending on severity and risk factors.

• Fever, rapidly spreading redness, or systemic symptoms warrant urgent evaluation.

Cultures are typically reserved for recurrent infections, severe infections, or immunocompromised patients.

Fungal infections are common in warm, moist areas such as feet, groin, under breasts, or skin folds.

They typically present with:

• Itchy, scaly rash

• Ring-shaped or well-demarcated borders

• Slow progression

Current practice favors topical antifungal therapy for localized infections. Oral antifungals are reserved for extensive, resistant, or recurrent cases.

Steroid creams alone can worsen fungal infections and are not recommended unless directed by a clinician.

Viral infections include:

• Herpes simplex (painful grouped blisters)

• Herpes zoster (shingles) (painful rash in a dermatomal pattern)

• Warts (HPV)

Antibiotics are not effective for viral infections. Antiviral medications may be prescribed when appropriate, especially for herpes or shingles.

Early treatment of shingles is recommended to reduce complications such as postherpetic neuralgia.

Certain features require urgent medical care:

• Rapidly spreading redness

• Severe pain out of proportion to appearance

• Fever or chills

• Red streaking from the area

• Swelling of the face or around the eyes

• Symptoms in patients with diabetes or weakened immune systems

In rare cases, deeper soft tissue infections may require imaging or emergency treatment.

Modern telehealth standards allow many skin infections to be diagnosed visually when high-quality images are available and symptoms are clearly described.

However, in-person evaluation is recommended when:

• There is concern for abscess requiring drainage

• The infection is rapidly worsening

• Systemic symptoms are present

Clinical judgment determines whether imaging, lab work, or referral is needed.

Skin infections often begin as small changes but can progress quickly if untreated. Current medical standards prioritize accurate diagnosis, targeted therapy, and avoiding unnecessary antibiotics.

If you notice spreading redness, increasing pain, drainage, or symptoms that aren’t improving, a licensed medical provider can help determine whether home care, prescription treatment, or urgent evaluation is needed.

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