Editing Callus (section)

===Corns===
{{Main|Corn (pathology)}}
[[Image:Corns.jpg|thumb|Painful corns]]

A [[corn (pathology)|corn]] (or ''clavus'', plural ''clavi'') is a cone-shaped callus that penetrates into the dermis, usually on the feet or hands. Corns may form due to chronic pressure or rubbing at a pressure point (in this skin over a bone), or due to scar tissue from a healing wound creating pressure in a weight-bearing area such as the sole of the foot. If there is constant stimulation of the tissue producing the corns, even after the corn is surgically removed, the skin may continue to grow as a corn.<ref name=":0">{{Cite web |title=Corns and Calluses: Symptoms, Treatment & Care Tips |url=https://my.clevelandclinic.org/health/diseases/16896-corns-and-calluses |access-date=2022-03-10 |website=[[Cleveland Clinic]]}}</ref>

The hard part at the center of the corn resembles a funnel with a broad raised top and a pointed bottom. Because of their shape, corns intensify the pressure at the tip and can cause deep tissue damage and [[Ulcer (dermatology)|ulceration]].<ref>{{Cite journal |last=Silverberg |first=Nanette B. |date=2019 |title=Corns (Clavus): Background, Pathophysiology, Etiology |url=https://emedicine.medscape.com/article/1089807-overview |journal=[[Medscape]] |url-access=registration}}</ref> The scientific name for a corn is ''heloma'' (plural ''helomata''). A hard corn is called a ''heloma durum'', while a soft corn is called a ''heloma molle''.

The location of the soft corns tends to differ from that of hard corns. Hard corns occur on dry, flat surfaces of skin. Soft corns (frequently found between adjacent toes) stay moist, keeping the surrounding skin soft. The corn's center is not soft however, but [[Induration|indurated]].

The specific diagnostic workup and treatments for corns may differ substantially from other forms of calluses.