A pinch callus or tyloma refers to the formation of a callus along the ridge of skin that is pinched. An example of this is on the inner side or under side of the big toe joint. It usually occurs as a result of a big toe functional deformity called hallux limitus, which is characterized by a stiff big toe joint.
Due to the stiff big toe joint, the toe does not flex during walking, and to overcome this restricted movement a person usually rolls off the inner side of the foot. As the foot rolls outwards the skin on the inner side of the big toe joint gets pinched, rubbing against the inside of the shoe, which leads to the formation of a pinch or spin callus, also called hallux pinch callus (hallux = big toe).
A pinch callus may cause pain and discomfort during walking. Moreover, in diabetics and people with poor circulation, calluses may be followed by skin ulceration, therefore proper evaluation and treatment is essential.
Use comfortable footwear and padding to prevent further irritation. Professional debridement of the callus can reduce its size and thus the discomfort that it causes.
Treating the cause of the problem:
Proper management includes correcting the underlying condition. If the underlying hallux limitus is not treated, the pinch callus will continue to reform.