Callus - 癒傷組織https://en.wikipedia.org/wiki/Callus
癒傷組織 (Callus) 是因反覆摩擦、壓力或其他刺激而形成的皮膚增厚區域。老繭通常無害,能防止水泡並提供保護。然而,過度增生可能導致皮膚潰瘍或感染。

治療 - 非處方藥
需先確認它不是疣。
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  • 左腳(腳底)與右腳(外側)都有老繭。
  • Corns (calluses) 通常對稱地出現在雙腳的受壓或鞋子摩擦的部位。如果在無壓力的區域出現類似的病變,則應懷疑疣。
References Corns 29262147 
NIH
Corns 因反覆摩擦或壓力而形成。Corn 是皮膚增厚的特定區域,而 callus 則較為分散。Corns 經常發生在運動員或有腳部問題(例如鞋子摩擦不均勻)的人身上,也常見於老年人、糖尿病患者和截肢者。Corns 應被視為一種症狀,而不是獨立的疾病。
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,也稱為雞眼,是診所常見的足部疾病。它是因摩擦或壓力導致的皮膚增厚區域,通常伴有疼痛。應將其與老繭或疣區分開來。老繭與之類似,但缺乏中央核心,疼痛較輕。治療的目的是緩解症狀並預防新發雞眼。治療此類疼痛可顯著改善患者的生活品質,尤其是老年人或活動量大的族群。
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.