A bunion causes a bulging bump on the joint of your largest toe and pushes the big toe into the other toes with considerable force. This can cause blisters and overlapping toe problems, among other issues.
A heel spur forms on the back of the heel from calcium deposits but it is related to an arch condition called plantar fasciitis.
Shoes that are too tight or too loose can cause pressure and rubbing that contribute to blister formation.
Cracked heels can worsen without treatment and lead to bleeding and infection and in severe cases amputation of a gangrenous infection may be necessary.