Calluses and corns
Clinical basis & sources
- Primary source
- OCP Expanding Scope of Practice
Sources used
- Minor Ailments PrescribingOntario College of Pharmacists · 2026
- Expanding Scope of Practice - Minor AilmentsOntario College of Pharmacists · 2026-05-28
- Ontario Regulation 256/24: GeneralGovernment of Ontario · 2026
- Minor Ailments: Drug Classes and Specified DrugsOntario College of Pharmacists · 2026
- Corn, CallusDermNet · 2024
- Corns and callusesNHS · 2026
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Allowable drugs under Schedule 4 (1)
Drugs an Ontario pharmacist may prescribe for Calluses and corns under O. Reg. 256/24, Schedule 4. Choice still depends on the assessment, contraindications, allergies, and product availability — this is the eligible list, not a recommendation.
- Salicylic acid
Symptoms this assessment screens
- Localized thickened skin consistent with corn or callus
- Likely pressure or friction trigger such as footwear, toe pressure, tools, or repetitive activity
- Skin is intact with no ulceration, bleeding, infection, or drainage
- No diabetes, neuropathy, peripheral vascular disease, poor circulation, foot ulcer history, or immunocompromise
- Presentation is not suspicious for wart, foreign body, fungal disease, ulcer, mole, melanoma, or other atypical lesion
Red flags — any positive means refer
- Diabetes, neuropathy, peripheral arterial disease, poor circulation, foot ulcer history, immunocompromise, or inability to inspect/protect the area
- Open skin, ulcer, bleeding, pus, spreading redness/warmth, severe swelling, severe pain, or suspected cellulitis
- Pigmented, changing, irregular, rapidly growing, bleeding, or diagnostically uncertain lesion
- Lesion on face, genitals, mucosa, inflamed skin, broken skin, mole, birthmark, or another non-corn/non-callus area
- No improvement after appropriate pressure relief and short salicylic acid trial, or pain/function worsens
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