Small circular nail depressions or notches are called nail pitting. Psoriasis and eczema sufferers often have it.
Nail pitting
When finger tips grow and nails bend around them, nail clubbing occurs. It frequently develops over years.
Nail clubbing
Spoon nails indicate iron deficient anemia. They may be caused by hemochromatosis, a liver disease.
Spoon nails
Aging can produce Terry's nails. It may also indicate a significant medical condition such liver disease, congestive heart failure, or diabetes.
Terry's nails
Beau's lines are nail grooves. They can arise when injury or sickness halt nail growth.
Beau's lines
In onycholysis, fingernails loosen and detach from the nail bed. The split nail turns hazy and white, yellow, or green.
Nail separation
Yellow nail condition can cause cuticle loss and nail bed separation. A respiratory condition like chronic bronchitis may cause yellow nail syndrome.
Yellow nail syndrome