Callushttps://en.wikipedia.org/wiki/Callus
Ko te Callus he wāhi kiri matotoru ka puta hei whakautu ki te waku, te pehanga, me ētahi atu irirangi. Ko te nuinga o ngā wāhi kāore i te kino, ā, ka āwhina ki te aukati i te pupuhi, me te tuku whakamarumaru. Heoi, ko te nui o te hanganga ka arai i ētahi atu raruraru, pērā i te mate kiri, te mate rānei.

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  • Kei te waewae maui (plantar) me te waewae matau (lateral).
  • Corns (calluses) ka puta i runga i ngā waewae e rua, i te wāhi ka pehia te pehanga, i te wāhi rānei e pehi ana te hu ki te waewae. Mēnā ka pā mai tētahi pāpaka rite ki tētahi wāhi kāore he pēhanga, me whakapae he kiritona.
References Corns 29262147 
NIH
Ka whanake ngā corn i te mirimiri, te pehanga rānei. Ko te corn he wāhi motuhake o te kiri matotoru, ko te callus ka horahia ake. He maha ngā wā ka pā ngā corn ki ngā kaitākaro, ki ngā tāngata he raru wāewae pērā i te waku kore tākete mai i ngā hu. Ka kitea anō hoki i roto i ngā kaumātua, te hunga mate huka, me te hunga haupā. Me kitea te corn i te tohu, kaua i te āhua takitahi.
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
Ko te Corn, e mohiotia ana ko te clavus, he mate waewae e kitea i roto i ngā whare haumanu. He wāhanga kiri matotoru nā te waku, te pehanga rānei, he mamae tonu. He mea nui ki te wehewehe i ngā wāea me ngā kiritona. He rite tonu ngā wāea, engari kāore i te puku o te puku, he iti ake te mamae. Ko te maimoatanga ko te whakakore i ngā tohu me te aukati i ngā witi kei te heke mai. Ko te rongoā mō tēnei mate mamae ka tino pai ake te oranga o ngā turoro, inā koa mō ngā tāngata pakeke, mō ngā tāngata kaha rānei.
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.