Treatment of Corn (Clavus) on the Foot

Types of Corns

1. Conservative (First-Line) Treatment

A. Footwear Modification

• The single most important intervention - addressing the root cause
• Well-fitted shoes with adequate toe box width and depth
• Avoid tight, narrow, or high-heeled footwear
• Extra-depth shoes for underlying deformities (hammer toe, bunion)

B. Padding and Offloading

• Donut-shaped foam or felt pads placed around (not over) the corn to redistribute pressure
• Silicone toe sleeves or interdigital spacers for soft corns
• Prefabricated or custom orthotics to offload pressure from metatarsal heads
• Orthopaedic insoles with metatarsal domes or bars

C. Soaking and Mechanical Debridement (Home Care)

• Soak foot in warm water 10-15 minutes to soften the corn
• Gently file with a pumice stone or foot file - reduces thickness over time
• Never use a blade at home, especially in diabetic patients

2. Keratolytic Therapy

Salicylic Acid (most widely used)

• Available as plasters, gels, liquids, and paints
• OTC concentration: 17% - adequate for most hard corns
• Medicated plasters: 40% - UK trial (J Foot Ankle Res) showed 40% salicylic acid plasters were as effective as scalpel enucleation with favourable cost outcomes
• Higher concentrations (up to 60%): used under medical supervision
• How to use: Apply only to the corn surface, protect surrounding skin with petroleum jelly, leave for 24-48 hours, remove, file gently, repeat
• Contraindicated in: diabetics, patients with peripheral neuropathy or poor circulation, broken skin

Urea-based Creams

• 15-40% urea creams - soften and hydrate hyperkeratotic skin
• Suitable for regular maintenance use

Lactic Acid

• Combined with urea in creams - mild keratolytic
• Safer for long-term use than salicylic acid

Trichloroacetic Acid (TCA)

• Applied by a clinician; causes chemical debridement and peeling
• Useful for resistant cases

3. Professional / Podiatric Treatment

Scalpel Paring / Enucleation

• The standard podiatry procedure for rapid relief
• Using a scalpel (#15 blade), the clinician shaves down the hyperkeratosis layer by layer until the central nucleus is reached and removed (enucleated)
• Provides immediate pain relief
• Must be repeated periodically as corns recur without addressing causative factors
• Caution: Do NOT perform in diabetic, immunocompromised, or vascularly compromised patients without proper assessment

Silver Nitrate Application

• Applied to the enucleated base with silver nitrate sticks
• Cauterises the base, slows regrowth
• Turns the treated area black temporarily

Intralesional Corticosteroid Injection

• For highly painful corns with associated bursitis
• Triamcinolone acetonide injected at the base
• Reduces inflammation and discomfort

4. Surgical Treatment (for Refractory Cases)

• Condylectomy / Exostectomy: Removal of the underlying bony prominence (exostosis, condyle) that creates the pressure point
• Digital osteotomy / arthroplasty: For hammer toe or claw toe deformities
• Metatarsal osteotomy: For plantar corns under metatarsal heads due to metatarsal head elevation or malposition
• Syndactyly procedure: For intractable soft corns between toes (removes part of the proximal phalanx to create space)

5. Special Situations

Diabetic Patients

• Avoid salicylic acid, blade debridement at home, and aggressive keratolytics
• Regular podiatry review is mandatory
• Even minor corn-related trauma can lead to ulceration and infection
• Custom diabetic footwear and total contact casting if ulceration develops

Soft Corns (Interdigital)

• Keep the web space dry - absorbent cotton or lamb's wool between toes
• Silicone interdigital spacers
• Antifungal powder if maceration is prominent
• Surgical removal of underlying condyle if recurrent

Children

• High salicylic acid concentrations are not recommended - risk of systemic salicylism from percutaneous absorption
• Focus on footwear, padding, and gentle mechanical debridement

6. Prevention

• Properly fitted footwear (re-measure feet periodically, especially after age 40)
• Moisture-wicking socks
• Regular use of emollient creams
• Early use of protective padding at pressure points
• Custom orthotics for structural foot deformities

Clinical Images

Quick Treatment Summary

Key principle: Treating the corn without addressing the underlying mechanical cause (footwear, deformity, gait) guarantees recurrence. Structural correction is required for a lasting cure.

Can Ciprofloxacin Eye Drops Be Given to a 3-Year-Old Child?

Short Answer: Yes - it is safe and approved.

Regulatory Approval Status

"Safety and effectiveness of Ciprofloxacin Ophthalmic Solution have been established in all ages. Use of ciprofloxacin is supported by evidence from adequate and well-controlled studies of ciprofloxacin in adults, children, and neonates."

• Originally approved December 1990
• In March 2017, the FDA expanded the pediatric indication to include children younger than 1 year following a formal review under the Best Pharmaceuticals for Children Act (BPCA)
• An FDA pharmacovigilance review covering 1990-2023 found no new safety signals in pediatric patients under 17 years, and no deaths attributable to the drug

The Key Concern: Fluoroquinolone Arthropathy

Indications in Children

• Bacterial conjunctivitis (pink eye) - most common use
• Bacterial corneal ulcers
• Prophylaxis after ocular trauma or foreign body

Dosing in a 3-Year-Old (Ciprofloxacin 0.3% Solution)

Bacterial Conjunctivitis

• Day 1-2: 1-2 drops in affected eye(s) every 2 hours while awake
• Day 3-7: 1-2 drops every 4 hours while awake
• Duration: 5-7 days total

Corneal Ulcer (under specialist supervision)

• More frequent dosing - every 15 min initially, tapering over days

One Important Distinction: Drops vs. Ointment

Precautions in Children

• Avoid contact with soft contact lenses (contains benzalkonium chloride preservative)
• Apply gentle nasolacrimal duct pressure after instillation to minimize systemic absorption (though this is negligible anyway)
• Supervise application - do not allow child to touch dropper tip to eye
• If no improvement after 7 days, refer to ophthalmology
• Use with caution if the child has a known hypersensitivity to any fluoroquinolone

Summary

A 3-year-old can safely receive ciprofloxacin 0.3% eye drops. The arthropathy risk associated with systemic fluoroquinolones does not apply to topical ophthalmic use. The FDA has established safety and effectiveness for all ages, including neonates, based on clinical trial data and post-market surveillance covering over 30 years of use.

Febrile Seizures - Complete Overview

1. Definition

• No intracranial infection (meningitis, encephalitis)
• No toxic encephalopathy
• No prior afebrile (non-febrile) seizure history
• No acute metabolic cause
• Tintinalli's Emergency Medicine, Rosen's Emergency Medicine, Textbook of Family Medicine 9e

2. Epidemiology

3. Classification

Simple Febrile Seizure (most common, ~70-75%)

• Generalized (tonic-clonic, not focal)
• Duration <15 minutes
• Occurs only once within a 24-hour period
• Age 6 months to 5-6 years
• No postictal neurologic deficit (other than brief drowsiness)

Complex (Complicated) Febrile Seizure (~25-30%)

• Duration >15 minutes (febrile status epilepticus if >30 min)
• Focal at onset or during the seizure
• Recurs within 24 hours
• Occurs in a child <6 months or >6 years
• Followed by Todd's paralysis (postictal focal weakness)
• Rosen's Emergency Medicine, Tintinalli's Emergency Medicine

4. Pathophysiology

• The exact mechanism is incompletely understood
• Fever lowers the seizure threshold in a developmentally susceptible brain
• It is thought that the rapid rise of temperature (or defervescence) - not absolute fever height - triggers the seizure, though data are not entirely consistent on this
• The immature brain (6 months to 5 years) has increased excitability and reduced inhibitory capacity
• Genetic susceptibility plays a significant role: autosomal dominant inheritance patterns identified; mutations in SCN1A (sodium channel) and GABRG2 (GABA receptor) genes found in some families with Generalized Epilepsy with Febrile Seizures Plus (GEFS+)

5. Causes / Precipitating Illnesses

• Roseola (HHV-6) - classically causes abrupt high fever followed by febrile seizure as temperature rises
• Otitis media
• Upper respiratory tract infections (viral)
• Urinary tract infections
• Gastroenteritis
• Influenza
• Post-vaccination fever (MMR most commonly; also MMRV, combined DTaP+PCV13)
  • MMR: risk window 8-14 days post-vaccination
  • DTaP: risk window within 48 hours
• Goodman & Gilman's, Textbook of Family Medicine 9e

6. Clinical Features

• Most seizures are generalized tonic-clonic
• Typically last under 6 minutes; fewer than 8% last >15 minutes
• Child often postictal (drowsy, confused) briefly after the event
• Most parents do not bring the child to medical attention until after the seizure has ended
• Temperature is usually >38.9°C (102°F) at time of seizure

7. Evaluation and Investigations

History

• Detailed seizure description (focal? duration? recurrence within 24h?)
• Symptoms of infection, medication use, toxic ingestions
• Developmental history, prenatal/birth history
• Family history of febrile seizures or epilepsy
• Vaccination history and recent vaccinations

Physical Examination

• Meningeal signs: neck stiffness, Kernig's sign, Brudzinski's sign
• Bulging/tense fontanelle
• Petechial rash (raises concern for meningococcemia)
• Level of consciousness and return to baseline neurologic status
• Focal neurologic deficits, Todd's paralysis

Investigations (AAP Guidelines)

• Harriet Lane Handbook 23rd ed., Tintinalli's, Rosen's, AAP 2024 updated guidelines

8. Treatment

During the Acute Seizure

• Usually self-limited - supportive care only
• Position child safely (lateral position to prevent aspiration)
• Do not restrain
• Clear airway

• Merck Manual 2025, Rosen's Emergency Medicine

After the Seizure

• Identify and treat the source of fever (antipyretics: paracetamol/ibuprofen)
• Note: Antipyretics do NOT prevent febrile seizure recurrence - they just provide comfort
• Observe in ED for several hours until neurologically back to baseline
• Discharge home if: alert and returning to baseline, fever source identified and treated, close follow-up available

Long-term / Prophylactic Treatment

• Goodman & Gilman's, Textbook of Family Medicine 9e, Corsello et al. 2024 systematic review (PMID 38653182)

9. Recurrence

• Overall recurrence rate: ~33% (1 in 3 children)
• Children <12 months: 50% recurrence risk
• Children >12 months: 30% recurrence risk
• Most recurrences happen within 1 year of the first event

Risk Factors for Recurrence

1. Age <1 year at first seizure (strongest predictor)
2. Family history of febrile seizures in first-degree relatives
3. Lower temperature at time of first seizure (<40°C)
4. Short duration between fever onset and seizure
5. Daycare attendance (higher infection exposure)
6. Developmental delay

• Tintinalli's, Textbook of Family Medicine 9e, Rosen's

10. Risk of Developing Epilepsy

Risk Factors for Later Epilepsy

1. Pre-existing neurological disorder or developmental delay
2. Family history of epilepsy (not just febrile seizures)
3. Complex febrile seizure (prolonged, focal, or recurrent within 24h)
4. First febrile seizure before 12 months of age
5. Todd's paralysis after the seizure
6. Abnormal EEG (if obtained)

11. Febrile Status Epilepticus

• Febrile seizure lasting >30 minutes (or repeated seizures totalling >30 min without recovery)
• Higher risk of subsequent hippocampal sclerosis and temporal lobe epilepsy (FEBSTAT study, 2024)
• Higher risk of meningitis vs simple febrile seizure (15-18% incidence of bacterial meningitis in some series)
• Requires LP, ICU-level management, and neurology consultation
• Managed with the full SE protocol (benzodiazepines → fosphenytoin → phenobarbital → anesthesia)

12. Parental Counseling (Key Points)

1. Febrile seizures do not cause brain damage in virtually all cases
2. The risk of developing epilepsy is very low (similar to general population after a simple seizure)
3. ~1 in 3 children will have another febrile seizure - this is not dangerous
4. Give fever-reducing medications for comfort, not to prevent seizures (antipyretics don't prevent recurrence)
5. If a seizure occurs: lay child on their side, clear airway, time the seizure, do not restrain or put anything in mouth
6. Call emergency services if: seizure lasts >5 minutes, child doesn't recover within 30 minutes, signs of neck stiffness, rash, child is very ill-looking
7. Educate on when to use rescue diazepam if prescribed for high-risk children

• Rosen's Emergency Medicine, Tintinalli's

13. Differential Diagnosis

• Bacterial meningitis / viral encephalitis (most important to exclude)
• Sepsis with seizure
• Hyponatremia / hypoglycemia / hypocalcemia
• Toxic ingestion
• Epilepsy (first afebrile seizure with concurrent febrile illness)
• Dravet syndrome (SCN1A mutation - presents like febrile seizures initially but has worse prognosis and treatment implications)
• Intracranial hemorrhage

Dravet syndrome is an important mimic - these children have repeated febrile convulsions starting in the first year of life that appear identical to febrile seizures, but eventually develop afebrile seizures. SCN1A genetic testing should be considered in children with repeated prolonged or hemiclonic febrile seizures beginning before 12 months.

14. Summary Algorithm

Child 6 months - 6 years with Seizure + Fever
              ↓
    Signs of meningitis?
    YES → LP, admit, treat empirically
    NO  ↓
    Simple or Complex?
    SIMPLE (<15 min, generalized, once in 24h)
      → No LP, no EEG, no imaging, no AEDs
      → Treat fever source, observe, discharge
      → Parental education and reassurance
    COMPLEX (>15 min, focal, recurrent in 24h)
      → Consider LP if <12 months or unimmunized
      → Consider EEG, neurology referral
      → No routine neuroimaging unless focal neuro deficit
      → Treat active seizure >5 min with benzodiazepine
      → Evaluate for Dravet syndrome if recurrent + hemiclonic