Bone spurs are typically smooth protrusions of extra bone growth, explains WebMD. Bone spur appearances vary depending on their location. Heel spurs may resemble small spikes, similar to canine dewclaws, while spine bone spurs often look like knobby ridges, according to Mayo Clinic.
Heel spurs may end in a sharp point and extend up to half an inch from the heel bone, notes WebMD. By contrast, bone spurs on the spine usually grow over the spinal cord column and give the appearance of melting bone, explains Mayo Clinic. Bone spurs on the finger joints resemble small lumps. These spurs often cause visible bumps on the fingers, according to WakeMed Health & Hospitals.