Callus - 愈伤组织https://en.wikipedia.org/wiki/Callus
愈伤组织 (Callus) 是因反复摩擦、压力或其他刺激而形成的增厚皮肤区域。老茧通常无害,有助于防止水泡并提供保护。然而,过度形成有时可能导致皮肤溃疡或感染等问题。

治疗 - 非处方药
首先需确认它不是疣。
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  • 左脚(足底)和右脚(外侧)有老茧。
  • Corns (calluses) 对称地发生在双脚上,即施加压力或鞋压在脚上的位置。如果在无压力的区域出现类似的病变,则应怀疑疣。
References Corns 29262147 
NIH
Corns 因反复摩擦或压力而形成。Corn 是皮肤增厚的局部区域,而 callus 则更为分散。Corns 常见于运动员或有脚部问题(例如鞋子摩擦不均匀)的人群。老年人、糖尿病患者和截肢者中也很常见。Corns 应被视为一种症状,而不是独立的情况。
A corn, also known as a calvus, heloma, or focal intractable plantar hyperkeratosis, is a type of callosity. Corns are uncomfortable, thickened skin lesions that result from repeated mechanical trauma due to friction or pressure forces. In the literature, confusing terminology is often used to call different types of hyperkeratotic skin lesions. Nevertheless, a corn should be distinguished from a callus, which is a more diffuse type of callosity. Thus, a corn is a well-delimited focal area of hyperkeratosis. This condition is often seen in athletes and patients exposed to unequal friction force from footwear or gait problems, including the elderly, patients with diabetes, and amputees. It should be regarded as a symptom rather than an effective disease.
 Clavus 31536205 
NIH
Corn(鸡眼)是诊所常见的足部疾病,因摩擦或压力导致皮肤局部增厚,常伴有疼痛。需要将其与老茧或疣区分开来。老茧与鸡眼相似,但没有中心硬核,疼痛也较轻。治疗的目标是缓解症状并预防鸡眼复发。有效治疗这种疼痛性疾病可显著改善患者的生活质量,尤其是老年人和活动频繁者。
A clavus or clavi (plural) is a frequently encountered condition in the out-patient clinic, known colloquially as a corn. It is one of the many hyperkeratotic lesions of the foot and therefore requires differentiation from other etiologies such as calluses or plantar warts. A clavus is a well-demarcated thickened area of the epidermis that has a central core. This skin lesion is most commonly found on the foot and is often painful. A clavus results from repeated friction, pressure, or trauma to a specific area of the foot. A callus is another hyperkeratotic skin lesion that is similar to a clavus. It is an area of thickened epidermis with less defined borders and is also the result of repeated mechanical stress. Additionally, calluses lack the painful central core seen with clavi. Calluses most commonly present on the hands and feet. The older and the physically active are most commonly affected by clavi. Treatment focuses on symptomatic relief and lifestyle modification to prevent future clavus formation. By treating this painful and sometimes life-altering skin lesion, physicians can have a profound impact on their patients’ lives.