Bunion is when your big toe points toward the second toe. This causes a bump on the inside edge of your toe.
Symptoms:

Red, calloused skin along the inside edge of the big toe
A bony bump at this site
Pain over the joint, aggravated by pressure from shoes Big toe turned toward the other toes

Corns and calluses are thickened layers of skin caused by repeated pressure or friction.
Symptoms:

Skin is thick and hardened.
Skin may be flaky and dry.
Hardened, thick skin areas are found on hands, feet, or other areas that may be rubbed or pressed.

A heel spur is a hook of bone that can form on the heel bone (calcaneus) and is associated with plantar fasciitis

A painful foot condition in the metatarsal region of the foot (the marked area, just before the toes, more commonly referred to as the ball-of-the-foot). This is a common foot disorder that can affect the bones and joints at the ball-of-the-foot. Metatarsalgia (ball-of-foot-pain) is often located under the 2nd, 3rd, and 4th metatarsal heads, or more isolated at the first metatarsal head (near the big toe).

Plantar fasciitis is irritation and swelling of the thick tissue on the bottom of the foot.

Symptoms:

The most common complaint is pain in the bottom of the heel.
It is usually worst in the morning and may improve throughout the day.
By the end of the day the pain may be replaced by a dull aching that improves with rest.
Most people complain of increased heel pain after walking for a long period of time.