Actinic keratosis - 光化性角化病
手背上的病变；如果手背长时间暴露在阳光下（开车时），就会发生这种情况。
还应考虑病毒疣和恶性疾病（例如鳞状细胞癌）。
伴有红斑的硬角化病变是其特征。
如果防晒霜没有正确涂抹在头皮上，随着年龄的增长，由于过度暴露在阳光下，可能会出现这种情况。
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References
Actinic keratoses 称为老年性角化病或日光性角化病。它们与长期暴露在阳光下有关，并可能在暴露在阳光下的皮肤上表现为粗糙的红色斑块。尽早发现并开始治疗非常重要，因为如果不及时治疗，它们可能会变成皮肤癌。
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 是皮肤细胞的异常生长，有转化为癌症的风险。它们通常在暴露在阳光下的皮肤上表现为平坦的斑点、凸起的肿块或粗糙的斑块，通常呈淡红色。 在初始阶段，通过触诊可能比目视检查更好地识别它们。
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 这样的皮肤病可以通过冷冻疗法（=冷冻）安全地治疗。
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).
光化性角化病的特征是表现为厚厚的、鳞状的或结痂的区域，通常感觉干燥或粗糙。尺寸通常在 2 到 6 毫米之间，但直径可以长到几厘米。值得注意的是，在清晰地看到病变之前，经常会在触摸时感觉到光化性角化病，并且其纹理有时与砂纸相比。
阳光照射与光化性角化病之间存在因果关系。它们经常出现在晒伤的皮肤上以及经常暴露在阳光下的区域，例如面部、耳朵、颈部、头皮、胸部、手背、前臂或嘴唇。大多数患有光化性角化病的人都患有不止一种。
如果临床检查结果不是典型的光化性角化病，并且仅根据临床检查不能排除原位或浸润性鳞状细胞癌（SCC）的可能性，则可以考虑活检或切除。
○ 诊断和治疗
#Dermoscopy
#Skin biopsy
#Cryotherapy
#5-FU
#Imiquimod