2006-12-14 2006-7-26 The formation of calluses is caused by an accumulation of dead skin cells that harden and thicken over an area of the foot. Some calluses have a deep seated core known as a nucleation. Causes of callus formation include high-heeled dress shoes and shoes that are too small. 144367 text/html 1.0 EN index,follow Calluses Relief Gel Insoles Foot Pain Medela Medela Pump In Style Advanced Ameda Purely Yours Breast Pump Float Gel Insoles Calluses Relief, Gel Insoles, Foot Pain, Medela, Medela Pump In Style Advanced, Ameda Purely Yours Breast Pump - A Medical Supply text