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Patient History & Clinical Presentation: Patient Profile: 20-year-old male. Mechanism of Injury: Initial injury occurred due to skin abrasion/friction from the iron hardware of a traditional sandal (khediya). Clinical Course & Progression: Started as a minor superficial wound/scrape. Over time, the wound progressively deteriorated and developed pus (purulent discharge). The patient repeatedly drained pus from the lesion manually. The patient subsequently used an unsterilized needle to scrape off the overlying crust/skin to drain additional pus. Current Status & Physical Appearance: The lesion is actively spreading and expanding in diameter. It presents as a well-demarcated, crusted, erythematous lesion with central yellowish/brownish slough/pus accumulation, consistent with a localized skin and soft tissue infection (likely ecthyma or secondary bacterial impetigo). Request for Medical Evaluation: What is the most likely clinical diagnosis and differential diagnosis for this spreading crusted lesion? What is the recommended pharmacological treatment plan (including specific topical/oral antibiotics, wound dressing, and tetanus prophylaxis evaluation)? What are the key red-flag symptoms that would necessitate immediate emergency clinical intervention?

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This needs an in-person examination soon, ideally today, because it is enlarging after repeated nonsterile manipulation and is located on the foot. From the photo, there is a round crusted/ulcerated lesion with surrounding redness, but a photo cannot establish depth, abscess, organism, or need for drainage. Do not squeeze it, scrape it, or use another needle.
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This needs an in-person examination soon, ideally today, because it is enlarging after repeated nonsterile manipulation and is located on the foot. From the photo, there is a round crusted/ulcerated lesion with surrounding redness, but a photo cannot establish depth, abscess, organism, or need for drainage. Do not squeeze it, scrape it, or use another needle.
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CDC clinical guidance wound management tetanus vaccination dirty wounds 2025

Most likely diagnosis: a traumatic bacterial skin infection, most consistent with ecthyma (a deeper ulcerative form of impetigo), with possible surrounding cellulitis. The photo shows a small round crusted ulcer with central brown-yellow crust/slough and a red inflamed rim. Repeated squeezing and scraping with an unsterile needle increases the risk of deeper infection, abscess, retained foreign material, and tetanus exposure.
Because it is reportedly enlarging and has produced pus, he should be examined in person today or within 24 hours. A clinician may need to gently remove nonviable crust, swab/culture the drainage, check for a small abscess needing drainage, and look for a foreign body from the sandal.

Important differential diagnoses

Most to less likely given the history:
  1. Ecthyma due to Staphylococcus aureus and/or group A streptococcus.
  2. Impetiginized traumatic abrasion/ulcer, meaning a friction wound secondarily infected by bacteria.
  3. Local abscess or infected epidermoid cyst, especially if there is a tender, soft, fluctuant pocket under the lesion.
  4. Cellulitis around the ulcer, if the surrounding red area is warm, tender, and expanding.
  5. Contact/friction dermatitis with secondary infection from the sandal strap.
  6. If it fails appropriate treatment, is unusually chronic, or develops satellite lesions: fungal infection, atypical mycobacterial infection, cutaneous leishmaniasis or other regional chronic-ulcer causes should be assessed. These are less likely from the history but should not be missed if it does not heal.

Recommended management

1. Stop traumatic manipulation

  • Do not squeeze, scrape, lance, or pick it.
  • Do not use an unsterilized needle again.
  • Avoid the same sandal or any friction/pressure over the site.
  • Do not use steroid-containing combination creams on the open infected area unless a clinician specifically directs it.

2. Wound cleaning and dressing

Until he is seen:
  • Wash hands before and after touching it.
  • Rinse gently once daily with clean running water or normal saline. Mild soap may be used on the surrounding intact skin.
  • Do not repeatedly pour hydrogen peroxide, strong iodine, alcohol, or harsh antiseptics into the wound, since these can damage healing tissue.
  • Pat dry, apply a non-adherent sterile dressing such as paraffin gauze or a non-stick pad, then a light gauze cover. Change daily or sooner if wet/soiled.
  • Keep the foot elevated when resting and reduce walking/friction.
  • Take a dated photograph and mark the edge of surrounding redness with a pen. Expansion beyond the line over hours is important information for a clinician.

3. Antibiotics

Because this is a purulent, worsening foot lesion and likely deeper than simple superficial impetigo, topical treatment alone may be inadequate. The exact prescription should be chosen after examination, local resistance patterns, allergies, renal function, and assessment for an abscess.
Typical clinician-directed options are:
  • For a very limited superficial impetigo-type lesion with no spreading redness: mupirocin 2% ointment, usually applied thinly 2-3 times daily for 5 days, after gentle cleansing.
  • For suspected ecthyma, spreading redness, cellulitis, or purulence, clinicians commonly use an oral anti-staphylococcal/anti-streptococcal antibiotic for about 5-7 days, reassessing at 48-72 hours. Examples include:
    • Cephalexin 500 mg orally every 6 hours, or
    • Flucloxacillin/dicloxacillin 500 mg orally four times daily, depending on local availability.
  • If there is a relevant MRSA risk, prior MRSA, recurrent boils, treatment failure, or culture result, a clinician may select doxycycline, trimethoprim-sulfamethoxazole, or clindamycin instead. These choices need clinical oversight because coverage of streptococci differs and adverse effects/interactions matter.
Do not self-start antibiotics from leftover tablets and do not combine multiple antibiotics without a prescription. If there is a true abscess, incision and drainage is often more important than simply adding an antibiotic.
For pain, if he can normally take them, paracetamol/acetaminophen or ibuprofen can be used according to the package or clinician's advice. Avoid ibuprofen if he has kidney disease, a stomach ulcer/bleeding history, is dehydrated, or has been told not to take NSAIDs.

Tetanus assessment

This should be treated as a dirty/contaminated wound because of chronicity, drainage, possible devitalized tissue, and needle manipulation.
  • If he has completed the primary tetanus vaccine series and the last tetanus-containing vaccine was within 5 years, a booster is generally not needed for this wound.
  • If his last tetanus-containing dose was 5 or more years ago, he should receive a Tdap or Td booster.
  • If vaccination history is unknown, incomplete, or fewer than 3 prior doses, he should receive a tetanus-containing vaccine. For a contaminated wound, clinicians also assess the need for tetanus immune globulin (TIG).
The CDC wound guidance supports booster assessment at 5 years for dirty wounds and TIG for dirty wounds in people with unknown or incomplete primary vaccination. Antibiotics do not substitute for tetanus prevention.

Go to emergency care immediately if any of these occur

  • Fever, chills, marked weakness, confusion, faintness, fast heartbeat, or vomiting
  • Rapid enlargement of redness or swelling over hours, or red streaks moving up the foot/leg
  • Severe pain, especially pain out of proportion to what is visible
  • Skin becoming purple, black, gray, numb, blistered, or producing a foul smell
  • Increasing pus, a soft/fluctuant swelling, or inability to bear weight
  • Swelling/redness of much of the foot or ankle
  • Numbness, cold/pale toes, or reduced movement
  • Diabetes, poor circulation, immune suppression, or fever with this lesion
  • Jaw stiffness, trouble swallowing, painful muscle spasms, or neck stiffness, which can be tetanus symptoms
The immediate priority is same-day clinical assessment, proper cleaning, culture if draining, tetanus verification, and prescription treatment rather than further self-drainage.
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