Actinic keratosis - 光化性角化病
手背上的病變；如果手背長時間暴露在陽光下（開車時），就會發生這種情況。
也應考慮病毒疣和惡性疾病（例如鱗狀細胞癌）。
伴有紅斑的硬角化病變是其特徵。
如果防曬霜沒有正確塗抹在頭皮上，隨著年齡的增長，由於過度暴露在陽光下，可能會出現這種情況。
男性額頭
References
Actinic keratoses 稱為老年性角化症或日光性角化症。它們與長期暴露在陽光下有關，並可能在暴露在陽光下的皮膚上表現為粗糙的紅色斑塊。儘早發現並開始治療非常重要，因為如果不及時治療，它們可能會變成皮膚癌。
Actinic keratoses, also known as senile keratoses or solar keratoses, are benign intra-epithelial neoplasms commonly evaluated by dermatologists. Often associated with chronic sun exposure, individuals with actinic keratosis may present with irregular, red, scaly papules or plaques on sun-exposed regions of the body. Timely detection and implementation of a treatment plan are crucial since actinic keratosis can potentially progress into invasive squamous cell carcinoma.
Actinic keratoses, also known as senile keratoses or solar keratoses, are benign intra-epithelial neoplasms commonly evaluated by dermatologists. Often associated with chronic sun exposure, individuals with actinic keratosis may present with irregular, red, scaly papules or plaques on sun-exposed regions of the body. Timely detection and implementation of a treatment plan are crucial since actinic keratosis can potentially progress into invasive squamous cell carcinoma.
Actinic keratoses 是皮膚細胞的異常生長，有轉化為癌症的風險。它們通常在暴露在陽光下的皮膚上表現為平坦的斑點、凸起的腫塊或粗糙的斑塊，通常呈現淡紅色。 在初始階段，透過觸診可能比目視檢查更好地識別它們。
Actinic keratoses are dysplastic proliferations of keratinocytes with potential for malignant transformation. Clinically, actinic keratoses present as macules, papules, or hyperkeratotic plaques with an erythematous background that occur on photoexposed areas. At initial stages, they may be better identified by palpation rather than by visual inspection.
Actinic keratoses are dysplastic proliferations of keratinocytes with potential for malignant transformation. Clinically, actinic keratoses present as macules, papules, or hyperkeratotic plaques with an erythematous background that occur on photoexposed areas. At initial stages, they may be better identified by palpation rather than by visual inspection.
像 actinic keratosis, solar lentigo, seborrheic keratosis, viral wart, molluscum contagiosum, and dermatofibroma 這樣的皮膚病可以透過冷凍療法（=冷凍）安全地治療。
Skin diseases like actinic keratosis, solar lentigo, seborrheic keratosis, viral wart, molluscum contagiosum, dermatofibroma can be safely treated with cryotherapy (=freezing).
Skin diseases like actinic keratosis, solar lentigo, seborrheic keratosis, viral wart, molluscum contagiosum, dermatofibroma can be safely treated with cryotherapy (=freezing).
光化性角化症的特徵是表現為厚厚的、鱗狀的或結痂的區域，通常感覺乾燥或粗糙。尺寸通常在 2 到 6 毫米之間，但直徑可以長到幾公分。值得注意的是，在清晰地看到病灶之前，經常會在觸摸時感覺到光化性角化病，其紋理有時與砂紙相比。
陽光照射與光化性角化症之間有因果關係。它們經常出現在曬傷的皮膚上以及經常暴露在陽光下的區域，例如臉部、耳朵、頸部、頭皮、胸部、手背、前臂或嘴唇。大多數患有光化性角化症的人都患有不只一種。
如果臨床檢查結果不是典型的光化性角化病，並且僅根據臨床檢查不能排除原位或浸潤性鱗狀細胞癌（SCC）的可能性，則可以考慮活檢或切除。
○ 診斷與治療
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#Skin biopsy
#Cryotherapy
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