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- Presentation
Diagnosis and Treatment of Actinic Keratosis on the Back of the Hands
Description
The talk reviewed diagnosis and treatment of actinic keratosis on the back of the hands, emphasizing that acral skin differs from facial skin because it has a thicker stratum corneum, less follicular penetration, and more mechanical stress. These lesions are common in older adults, outdoor workers, and immunosuppressed patients because of chronic sun exposure, and the speaker stressed the field cancerization concept: visible keratoses are only the surface of broader molecular damage. Painful, hyperkeratotic, nonhealing, or suspicious lesions may indicate early invasion, so dermoscopy, biopsy, or other imaging tools may be needed to distinguish actinic keratosis from squamous cell carcinoma. Treatment options were divided into lesion-directed and field-directed approaches. Cryotherapy remains effective and often has the highest clearance, but recurrence, hypopigmentation, and caution over tendons are important concerns. Field therapies include 5-FU, imiquimod, photodynamic therapy, diclofenac, and emerging options such as tirbanibulin, though many are used off-label on the hands. Evidence suggests 5-FU is highly effective but can cause intense inflammation and temporary impairment of daily activities; imiquimod efficacy improves with more frequent dosing but tolerability worsens; and photodynamic therapy offers strong efficacy, good patient satisfaction, and possible cosmetic rejuvenation benefits, though recurrence can still be common. Combination strategies, especially 5-FU plus calcipotriol, were highlighted as promising, and future roles for pretreatment with ablative fractional lasers were mentioned.
View moreConclusions
- Actinic keratoses on the back of the hands are common because of lifelong UV exposure, especially in older, outdoor, and immunosuppressed patients with inadequate photoprotection.
- Because acral skin is thicker and more mechanically stressed than facial skin, hand lesions often require different treatment considerations and may respond differently to topical therapy.
- Visible AKs on the hands should be viewed as part of a broader field-cancerization process, so therapy should address both individual lesions and the surrounding damaged skin.
- Painful, hyperkeratotic, nonhealing, or otherwise suspicious hand lesions should raise concern for invasive squamous cell carcinoma and prompt dermoscopic assessment or biopsy.
- Cryotherapy remains the most effective lesion-directed treatment for complete clearance, but recurrence on the hands is higher and hypopigmentation is a notable risk.
- 5-FU is a highly effective field therapy and is considered a gold standard for acral field cancerization, but its inflammatory side effects can limit daily function and tolerability.
- Combining 5-FU with calcipotriol appears especially promising because it may enhance lesion reduction through immune activation.
- Imiquimod can work for acral AK, but higher application frequency improves efficacy at the cost of substantially worse tolerability and dropout rates.
- Photodynamic therapy shows strong efficacy for acral AK and may be particularly well suited for difficult hand lesions, while also offering cosmetic and rejuvenating benefits.
- The main limitation of conventional PDT is pain and recurrence, but modified light approaches and pretreatment strategies may improve comfort and outcomes.
- Overall, the best management of acral AK likely requires choosing between lesion-directed and field-directed approaches based on lesion burden, tolerability, and functional impact, with combination therapy often offering the most practical balance.
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- Dlott AH et al. (2024) Clin Drug Invest 44:733–737.
- Ulrich M et al. (2024) Photodiagnosis Photodyn Ther 49:104820.