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Cream for palms and soles

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Topical Drug/Formulation Options for Palmoplantar Keratoderma / Hyperkeratosis

Palmoplantar keratoderma (PPK) refers to a group of disorders marked by excessive keratin on the palms and soles. Topical therapy is the first line; systemic agents are reserved for severe, refractory, or hereditary cases.

1. Keratolytic Agents (First Line Topically)

These work by softening and loosening the thickened stratum corneum to allow shedding of excess keratin.
AgentConcentrationFormNotes
Salicylic acid5-20%Cream, ointment, gelMost widely used keratolytic; higher concentrations (10-20%) for thick PPK plaques; available as 10% cream
Urea20-40%Cream, lotionHumectant + keratolytic; 40% urea cream used for very thick hyperkeratosis; often combined with occlusion
Ammonium lactate (lactic acid)12% (topical)Cream, lotionMild keratolytic + humectant; useful for maintenance and milder hyperkeratosis
Alpha-hydroxy acids5-12%CreamLactic acid, glycolic acid - similar mild keratolytic + moisturizing action
From Dermatology 2-Volume Set 5e: "Humectant and keratolytic topical products containing urea, ammonium lactate, or salicylic acid (5-6%) may be helpful" for palmoplantar desquamation.

2. Topical Retinoids

  • Tazarotene 0.05-0.1% cream/gel - modulates keratinocyte differentiation; used in PPK, though palmoplantar skin tolerates it better than facial skin
  • Tretinoin 0.025-0.1% cream - less commonly used topically on palms/soles due to irritation, but reported for focal PPK

3. Topical Steroids

  • Not routinely recommended for pure hyperkeratosis/PPK without associated inflammation.
  • They are useful only if there is concurrent dermatitis (e.g., hand eczema overlapping with hyperkeratosis). Dermatology 5e explicitly notes: "Topical corticosteroids are not useful unless there is associated dermatitis."

4. Novel / Targeted Topical Agents

  • Erlotinib 1% ointment + salicylic acid 10% cream (combination): reported to improve PPK due to keratin 16 mutation (striate/focal PPK type) - Dermatology 5e.
  • Topical calcipotriol: reported in epidermolytic PPK (Vörner type).

5. Occlusion Technique

A practical method that enhances penetration on thick palmoplantar skin:
  1. Apply keratolytic (e.g., 40% urea or 10-20% salicylic acid ointment) to palms/soles at night
  2. Cover with plastic wrap or cotton gloves/socks
  3. Leave overnight; wash off in the morning

6. Systemic Options (when topicals fail)

For hereditary/severe PPK, oral retinoids are the mainstay:
  • Acitretin 10-25 mg/day - good response noted in striate PPK and arsenical keratoderma (combination with keratolytics)
  • Etretinate (historical; replaced by acitretin)
  • Isotretinoin (less preferred for PPK vs acitretin)
Arsenical keratoderma specifically responds to a combination of keratolytics + low-dose acitretin per Andrews' Diseases of the Skin.
For aquagenic PPK: botulinum toxin injections, 20% aluminum chloride hexahydrate followed by urea cream, tap water iontophoresis, or oral acitretin have been described - Dermatology 5e.

Summary: Practical Prescribing Ladder

  1. Mild: Urea 20-30% cream or ammonium lactate 12% cream twice daily
  2. Moderate: Salicylic acid 10-20% in petrolatum or cream base (overnight with occlusion)
  3. Severe / refractory: Add oral acitretin; consider erlotinib ointment for keratin mutation PPK
  4. With dermatitis: Topical corticosteroid (e.g., betamethasone dipropionate 0.05%) is appropriate
Sources: Andrews' Diseases of the Skin, p. 250 | Dermatology 2-Volume Set 5e, p. 1125, 1130 | Fitzpatrick's Dermatology, p. 866
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