{
  "schema_version": 1,
  "kind": "condition",
  "id": "corn-and-callus",
  "name": "Corn and Callus",
  "category": "chronic",
  "sources": "NICE Clinical Knowledge Summaries: Corns and calluses 2021 · Salactol Collodion (salicylic acid 16.7% + lactic acid 16.7%) SmPC sections 4.2-4.3 (eMC product 3766) · No labelled dose - a procedure, not a medicine",
  "review_status": "reviewed",
  "verified_against": "Salactol Collodion (salicylic acid 16.7% + lactic acid 16.7%) SmPC sections 4.2-4.3 (eMC product 3766) · No labelled dose - a procedure, not a medicine · Corns - disease-level clinical article (corn-and-callus-clinical.txt)",
  "verified_date": "2026-08",
  "treatments": [
    {
      "id": 503,
      "generic": "Salicylic acid",
      "line": 1,
      "is_adjunct": false,
      "form": "topical",
      "strength_mg": null,
      "adult_dose": "Apply a salicylic acid 12.6% to 40% solution or self-adhesive pad directly onto the corn or callus once daily, usually at night, after soaking the foot in warm water and paring dead skin with a pumice stone",
      "adult_duration": "Up to 12 weeks",
      "dose_source": "Corns - disease-level clinical article (corn-and-callus-clinical.txt) for the strength range: \"Topical keratolytic medications may be applied to the corns, including salicylic acid 12.6% to 40% as a pad or a solution.\" The Salactol Collodion SmPC (salicylic acid 16.7% with lactic acid 16.7%, eMC product 3766) is the held Egyptian-market example and supplies the method: \"Salactol should be applied once daily usually at night. It can take up to twelve (12) weeks for resistant lesions to disappear\".",
      "rationale": "Keratolytic that softens and breaks down the thickened keratin of a corn or callus, allowing the hardened skin to be pared away; avoided where circulation or sensation is impaired because it can cause tissue damage in that setting.",
      "cautions": [
        "Strictly contraindicated in diabetic patients, peripheral vascular disease, or peripheral neuropathy due to risk of tissue necrosis and foot ulceration.",
        "Protect surrounding normal skin with petroleum jelly or zinc oxide ointment prior to application.",
        "Do not apply on broken, inflamed, or infected skin.",
        "Collodion is flammable - no smoking or naked flame until it has dried."
      ],
      "peds_mgkg_low": null,
      "peds_mgkg_high": null,
      "peds_max_mg": null,
      "peds_basis": null,
      "peds_unit": null,
      "peds_note": "For adults, children and the elderly. Apply once daily usually at night.",
      "peds_min_weight_kg": null,
      "peds_max_weight_kg": null,
      "peds_age_min_months": null,
      "peds_age_max_months": null,
      "peds_age_bands": null,
      "peds_doses": null,
      "brands": [
        {
          "trade_name": "SALICYLIC ACID COLLODION 12% PAINT B.P.2001",
          "scientific_name": null,
          "normalized_ingredient": null,
          "manufacturer": "UNIPHARMA CO. > UNIPHARMA",
          "price_egp": 3.0,
          "pack_count": null,
          "unit_price": null,
          "strength_mg": null,
          "exact_strength": true,
          "exact_form": false,
          "discontinued": false,
          "also_contains": null
        },
        {
          "trade_name": "SALICYLIC ACID SOAP (WEISER) 45 GM",
          "scientific_name": null,
          "normalized_ingredient": null,
          "manufacturer": "WEISER",
          "price_egp": 15.0,
          "pack_count": null,
          "unit_price": null,
          "strength_mg": 45000.0,
          "exact_strength": true,
          "exact_form": false,
          "discontinued": false,
          "also_contains": null
        }
      ],
      "condition_id": "corn-and-callus"
    },
    {
      "id": 505,
      "generic": "Referral & safety-netting (no drug therapy)",
      "line": 1,
      "is_adjunct": false,
      "form": null,
      "strength_mg": null,
      "adult_dose": null,
      "adult_duration": null,
      "dose_source": "Corns - disease-level clinical article (corn-and-callus-clinical.txt)",
      "rationale": "Carries the referral criteria and warning signs for this condition, which apply whichever treatment is chosen.",
      "cautions": [
        "RED FLAG - Patients with peripheral neuropathy / diabetes should avoid self-application of salicylic acid plasters due to risk of skin sloughing and ulceration."
      ],
      "peds_mgkg_low": null,
      "peds_mgkg_high": null,
      "peds_max_mg": null,
      "peds_basis": null,
      "peds_unit": null,
      "peds_note": null,
      "peds_min_weight_kg": null,
      "peds_max_weight_kg": null,
      "peds_age_min_months": null,
      "peds_age_max_months": null,
      "peds_age_bands": null,
      "peds_doses": null,
      "brands": [],
      "condition_id": "corn-and-callus"
    },
    {
      "id": 504,
      "generic": "Mechanical debridement and pressure offloading",
      "line": 1,
      "is_adjunct": true,
      "form": null,
      "strength_mg": null,
      "adult_dose": "Soak affected area in warm water for 10-15 minutes, gently rub hyperkeratotic tissue with pumice stone or foot file, and apply felt doughnut pads around lesion",
      "adult_duration": "Ongoing / 2-4 weeks",
      "dose_source": "No labelled dose - a procedure, not a medicine",
      "rationale": "Offloading pressure and replacing ill-fitting shoes is necessary to prevent recurrence even after chemical keratolysis",
      "cautions": [
        "Never use razor blades or sharp knives for self-trimming at home.",
        "Refer diabetic patients directly to a podiatrist or diabetic foot clinic for professional care."
      ],
      "peds_mgkg_low": null,
      "peds_mgkg_high": null,
      "peds_max_mg": null,
      "peds_basis": null,
      "peds_unit": null,
      "peds_note": "Ensure children wear properly fitted shoes with wide toe boxes",
      "peds_min_weight_kg": null,
      "peds_max_weight_kg": null,
      "peds_age_min_months": null,
      "peds_age_max_months": null,
      "peds_age_bands": null,
      "peds_doses": null,
      "brands": [],
      "condition_id": "corn-and-callus"
    }
  ]
}