Callushttps://en.wikipedia.org/wiki/Callus
Callus jẹ agbegbe ti awọ ara ti o nipọn ti o ṣẹlẹ gẹgẹ bi idahun si titẹ, ikọlu ti o nlọ lọwọ, tabi ibinu miiran. Callus kii ṣe ipalara ni gbogbogbo, ó sì ń rànlọwọ láti yago fún roro, pẹ̀lú fífi ààbò ṣàkóso. Sibẹsibẹ, iṣelọpọ ti o pọ ju le fa àwọn iṣoro míì, bíi ọgbẹ tàbí akóràn.

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  • Awọn callus wa lori ẹsẹ osi (eweko) ati ẹsẹ otun (ita ita).
  • Corns (calluses) maa n waye ní isunmọ́ ẹsẹ̀ mejeeji, níbi tí titẹ ti wà lórí tàbí níbi tí bàtà ti ń tẹ sí ẹsẹ̀. Bí ọ̀gbẹ́ bá ṣẹlẹ̀ ní àgbègbè tí kò ní titẹ, ó yẹ kí a fura sí wart kan.
References Corns 29262147 
NIH
Corns dagbasoke nitori fifi pa leralera tabi titẹ. Corn jẹ agbegbe kan pato ti awọ ti o nipọn, nigba ti callus tan kaakiri. Corns maa n waye ninu awọn elere idaraya tabi awọn eniyan ti o ni awọn iṣoro ẹsẹ bii ija aiṣedeede lati bata. Wọn tun wọpọ laarin awọn agbalagba, awọn alamọ‑ara, ati awọn amputees. Corns yẹ ki a ka wọn si aami aisan, kii ṣe ipo ti o da duro.
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, ti a tún mọ̀ sí clavus, jẹ́ ipo ẹsẹ́ tó wọ́pọ̀ tí a máa rí ní ilé‑ìwòsàn. Ó jẹ́ àgbègbè tí ó ní ìpò tó gùn ní awọ̀ tí ó wáyé nípasẹ̀ ìjà tàbí ìtẹ̀, tí ó máa ń fa irora. Ó ṣe pàtàkì láti yà á kúrò nínú calluses tàbí warts. Calluses jẹ́ irú rẹ̀ ṣùgbọ́n kò ní àárín àárín, kò sì ní irora. Ìtọ́jú ń dojú kọ́ láti yọkúrò ní ààmì àìlera àti láti dènà ìtànkálẹ̀ àwọn àkúnya. Ìtọ́jú ipo irora yìí lè mú ìgbésí ayé aláìsàn dára gan-an, pàápàá jùlọ fún àwọn agbalagba tàbí àwọn ènìyàn tó ń ṣe iṣẹ́ àtàwọn tó ń ṣeré.
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.