Callus https://en.wikipedia.org/wiki/Callus
Ko te Callus he waahi kiri matotoru ka puta hei whakautu ki te waku, te pehanga, me etahi atu irirangi. Ko te nuinga o nga waea karekau he kino me te awhina ki te aukati i te pupuri (blister), me te tuku whakamarumaru. Heoi, ko te nui o te hanganga ka arai i etahi atu raruraru, penei i te pāwera (ulcer), te mate (infection) ranei.

Maimoatanga ― OTC Drugs
He mea nui kia mohio ehara i te kiritōna (wart).
#Salicylic acid, brush applicator [Duofilm]
#Salicylic acid, self-adhesive bandages
#Salicylic acid, tube application
#40% urea cream
Ētahi atu korero ― Maori
References Corns 29262147 
NIH
Corns ka whanake mai i te mirimiri, te pehanga ranei. Ko te korona (corn) he waahi motuhake o te kiri matotoru, ko te callus ka horahia ake. Korona (corn) he maha nga wa ka pa ki nga kaitakaro, ki nga taangata he raru waewae penei i te waku mate huka (diabetes) mai i nga hu. Ka kitea ano hoki i roto i nga kaumātua, te hunga mate huka (diabetes), me te hunga hāpae (amputees). Ko te korona (corn) me kitea he tohu, kaua ko te ahua 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 corn e kitea ana i roto i ngā whare haumanu. He wāhanga kiri matotoru nā te waku, te pēhanga rānei, he mamae tonu. He mea nui ki te wehewehe mai i ngā callus me ngā kiritona. He rite tonu ngā callus 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 wart kei te heke mai. Ko te rongoā i 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.