An interdigital clavus (soft corn) is located between the toes (usually the fourth and fifth toes) and is very painful due to constant pressure on it.
A clavus (also called corn or heloma) is a painful callus under the foot or on or between the toes. A corn is caused by increased callus formation in an area where the skin is chronically exposed to pressure. The growing callus (sometimes pointed in shape) burrows into the flesh and this causes pain.
The main causes are ill-fitting footwear and bone and positioning deformities of the toes.
Your treating doctor will discuss the treatment options with you.