Foot corns management
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foot corn clavus management treatment
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Foot Corns (Clavus) — Management
What Are Corns?
Corns are circumscribed, horny, conical thickenings with the base on the surface and the apex pointing inward, pressing on subjacent structures. The inward-pointing core causes dull/boring or sharp/lancinating pain by compressing underlying sensory nerves.
Two main types:
| Feature | Hard Corn | Soft Corn |
|---|---|---|
| Location | Dorsa of toes, sole, subungual | Between toes (usually 4th interdigital space) |
| Appearance | Shiny, polished surface with a visible core after paring | Soft, soggy, white/macerated |
| Cause | Friction or pressure | Maceration from sweat + adjacent bony pressure |
Differentiating Corn from Plantar Wart
| Feature | Corn | Plantar Wart |
|---|---|---|
| Pain provocation | Perpendicular (direct) pressure | Lateral squeeze |
| On paring | Clear, horny core | Elongated dermal papillae with pinpoint bleeders |
| Skin lines | Pass through the lesion | Interrupted |
| Onset | Slow, over months-years | Variable |
Also consider in the differential: digital bursa, porokeratosis plantaris discreta, dermal/epidermal malignancies, and keratosis punctata.
Management
1. Conservative / Non-Operative
Pressure & Friction Relief (First-line)
- Corrective footwear with a wider toe box
- Application of a ring of soft felt wadding (donut pad) around — not over — the corn
- Thicker socks, or a thin cotton sock layer under a thicker outer layer to reduce shear
- Soaking feet in hot water to soften keratin before paring
Keratolytic Therapy
- 40% salicylic acid plaster is the mainstay:
- Pare the corn carefully, emphasizing removal of the central core
- Apply the plaster; soak the foot for 30 minutes before reapplication enhances effect
- After 48 hours, remove plaster, rub off white macerated skin, reapply
- Continue until corn resolves
Emollients & Moisturizers
- Urea-based creams or lactic acid preparations help soften hyperkeratotic tissue between debridements
2. Office Débridement
- Use a No. 10 or No. 15 scalpel blade, held parallel to the lesion
- Remove hyperkeratotic tissue in thin layers with small straight or circular motions
- Direct pressure downward into the lesion should be avoided — pressure directed laterally/tangentially
- Hyperkeratotic skin is devoid of innervation, so patients usually tolerate debridement without local anesthetic
- Repeat periodically; this provides symptomatic relief but is not curative without addressing underlying cause
3. Orthotic & Biomechanical Correction
- Custom or off-the-shelf orthotics to redistribute pressure, especially for intractable plantar keratomas beneath metatarsal heads
- Address underlying structural issues: permanently plantar-flexed or hypermobile metatarsals, forefoot/rearfoot joint instability
- Correcting bony angulation with padding/orthotics should be trialed before considering surgery
4. Surgical & Procedural Options
- Punch excision — effective for small, discrete lesions
- Er:YAG laser ablation — precise ablation of the corn
- Simple excision — effective for soft interdigital corns
- Removal of underlying bony abnormality (exostosis or spur): critically important for long-standing corns where a bony prominence sustains the corn — without removing this, cure is unlikely
5. Special Considerations
- Diabetic patients: Must be managed with extreme caution; aggressive debridement or chemical agents can lead to ulceration. Referral to podiatry is strongly advised.
- Recurrence: Inevitable unless the underlying biomechanical cause (footwear, bony deformity, gait abnormality) is corrected.
- Soft corns with exostosis: There is often an exostosis at the metatarsophalangeal joint causing pressure — this may require surgical correction.
Post-Treatment
- Pain controlled with ice, NSAIDs, or acetaminophen
- Avoid creating plantar scarring — walking on plantar scars is painful and disabling
- Chemical burns from salicylic acid can create a sterile abscess (rarely infected)
Sources:
- Andrews' Diseases of the Skin: Clinical Dermatology (Clavus chapter)
- Pfenninger and Fowler's Procedures for Primary Care, 3rd Ed. (Plantar Corn chapter, pp. 1366–1370)
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