The Callus Picture will tell you that this is a condition which occurs due to hyperkeratosis. The term hyperkeratosis denotes a condition in which case the skin becomes too thick and pressurised. The callas is a sort of a prominent bone type. It is the ball under the foot at the heel area. When you stand for a long time this part of the body can feel a tremendous pain. A callas is a sort of a yellow or dark brown skin condition and this discoloration of the skin can be controlled quite aptly.The Callus Picture can make you understand that this is the thick and most hardened area of the body and if it is not taken care at the proper time it can lead to a genuine excruciating condition.