6.5 Treatment of Xerosis, Fissures, Nail Disorders, and Callus

Treat the Mechanism, Not Just the Surface

Minor-appearing skin and nail problems can become ulcer portals in an insensate or ischemic foot. Before treatment, assess protective sensation, perfusion, edema, infection, footwear, deformity, self-care ability, medications, and bleeding risk. A cosmetic procedure that creates a wound is not benign. Conversely, avoiding all care can allow callus or nail pressure to progress. The treatment plan balances those risks and stays within professional scope.

Xerosis and Fissures

Dry intact skin is managed with gentle washing, careful drying, and a fragrance-free emollient applied to plantar and dorsal surfaces. Urea-containing or other keratolytic moisturizers may help thick scale when appropriate, but strong agents are not placed on open wounds or inflamed skin without a specific order. Avoid lotion between the toes because retained moisture promotes maceration. The patient should not soak the feet, use harsh chemicals, or test water temperature with an insensate foot.

A fissure is examined for depth, bleeding, drainage, surrounding inflammation, and ischemic change. Clean and protect the split, moisturize adjacent intact skin, and reduce tensile stress and heel pressure. A superficial dry fissure differs from a draining deep crack with cellulitis. The latter needs infection evaluation; a necrotic fissure or nonhealing heel in a poorly perfused foot needs vascular assessment. Occlusive products can help selected dry fissures but should not trap uncontrolled drainage or infection.

Corn and Callus Care

Callus is the skin’s response to repeated stress, but thick callus can increase focal load and conceal hemorrhage or ulceration. A trained clinician may pare it in thin layers under direct vision after assessing circulation and anatomy. Stop at viable tissue and examine the newly visible surface. Patients with neuropathy, PAD, poor vision, limited reach, or anticoagulation concerns should not use razors, corn plasters, or caustic acids at home.

Reduction alone is temporary. Identify the pressure source: a prominent metatarsal head, rigid toe, limited ankle motion, worn insole, shallow shoe, high activity, or altered gait after amputation. Offloading, footwear modification, an orthosis, activity adjustment, or surgical consultation may be needed. A corn between toes requires pressure separation and footwear space, not repeated acid application.

Thick and Fungal Nails

For onychauxis or onychogryphosis, qualified mechanical reduction decreases shoe pressure and the risk of injury to adjacent digits. Cut or file only the visible plate, preserve the folds and hyponychium, and recheck shoe depth. A thick nail may reflect fungus, repetitive trauma, psoriasis, age-related change, or several causes together.

Topical antifungals have a role in limited superficial disease but require long courses and realistic expectations. Before oral antifungal treatment, confirm the diagnosis when feasible through an appropriate nail specimen because dystrophy is not specific. Review liver disease, medication interactions, monitoring requirements, organism, extent, and patient goals. Treat coexisting tinea pedis and moisture problems to reduce reservoirs and fissuring. Resolution is judged by healthy new growth over time, not immediate normalization of the old plate.

Ingrown Nail and Paronychia

Early ingrown-nail care reduces shoe pressure, keeps the fold clean, and avoids digging into the margin. A trained clinician may use conservative splinting or remove a nail portion when indicated and within scope. Recurrent disease may require partial avulsion with matrix treatment, but perfusion and infection status influence procedural planning. Total nail removal is not the default for a single involved edge.

Paronychia is evaluated for abscess, cellulitis, drainage, foreign body, ingrown margin, and systemic signs. A localized abscess generally requires drainage by a qualified professional; antibiotics are selected based on severity and clinical context rather than prescribed for every mild fold irritation. Spreading infection, ischemia, immunocompromise, deep ulcer, exposed bone, or systemic illness warrants escalation. A swollen entire toe or chronic drainage near bone raises concern for deeper infection.

Follow-Up and Self-Management

After treatment, document skin or nail findings, procedure, response, footwear action, and planned interval. Teach daily inspection, proper filing or referral, sock and shoe checks, and urgent signs. Avoid moralizing when a problem recurs; verify that the patient has shoes, supplies, vision, dexterity, transportation, and help. Effective treatment leaves the barrier intact, removes focal stress, and makes recurrence less likely.

Coordinating Recurrence Prevention

Schedule follow-up from risk and growth rate rather than a universal nail-care interval. A rapidly recurring callus calls for renewed mechanical assessment; recurrent paronychia calls for review of nail shape, cutting technique, edema, and shoe pressure. Share new ischemic or infectious findings promptly with the relevant clinician. The maintenance visit is therefore an opportunity to detect a changing foot, not merely to repeat the previous procedure.

Treatment Selection Table