Corns and callosities refer to the localized thickenings of the skin that appear over sites of repeated trauma and pressure.
Corns are well-demarcated small areas of thickened skin most commonly seen over the dorsolateral aspect of the fifth toe but may be seen at other places also. They are conical in shape with the apex pointing inwards into the tissue and hence are tender on vertical pressure. Paring reveals a central nucleus. Soft corns are located in the third and fourth toe web spaces.
Calluses are diffuse non-tender areas of thickened skin with indefinite borders commonly present in areas of repeated friction. The normal skin markings can be seen over callosities and they lack a central nucleus.
Plantar warts constitute 25 to 35 % of all warts. They begin over pressure points like heels, heads of metatarsals, below toes, and the forefoot as small, shiny, sago-grain papules. They soon become well-defined and rounded and develop rough and hyperkeratotic surface with a surrounding collar of thickened horn.
A mosaic wart results due to the confluence of multiple lesions into one large, usually flat lesion.
Reveals the skin markings to be discontinuous over the warts.
Plantar warts may be differentiated from corns and callosities on clinical grounds as outlined above.
Plantar warts commonly recur despite treatment. Hence, avoidance of nail-biting, use of rubber gloves during swimming and sticking to the use of one’s own towel and clothing can prevent their further spread to other areas and to others. Various modalities of treatment are:
For more information consult a warts specialist online --> https://www.icliniq.com/ask-a-doctor-online/dermatologist/wartsLast reviewed at: 15.May.2019