If you have lines on your nails, it means you have c…See more

harmless, especially in individuals with darker skin tones, a dark vertical streak can sometimes indicate subungual melanoma, a serious form of skin cancer.
 If a dark stripe appears suddenly, changes shape, or extends into the surrounding skin, a dermatologist should examine it promptly.
Clubbing of the nails is another important sign.
This condition causes the fingertips to enlarge and the nails to curve downward around the fingertips.
 Clubbing develops gradually and is often associated with chronic lung diseases, heart disease, inflammatory bowel disease, or certain cancers.
It reflects long-term low oxygen levels in the blood.
Horizontal ridges across the nails,