The reason for your good idea is nail peeling: it occurs mostly in fingernails, and at first it turns white and grows from the free edge of nails, and gradually spreads to the root of nails, showing grayish white, which is softer than normal nails and lacks luster. It is single or mostly in fingers, less in toes, and often has no systemic symptoms.

Nail hook: The deck gradually thickens into the shape of a mountain tip, which can reach the size of a broad bean. The rough surface is black, dark gray or dark green. With the growth of the deck, it bends forward or sideways into a hook shape, or even forms an eagle claw. The deck is opaque and tarnished, and there are many trauma incentives and few systemic symptoms.

Nail hook shape: mostly occurs in fingernails, and a few occur in toenails. The deck is thin and soft, the periphery is rolled up, the center is concave, and even spoon-shaped, often accompanied by palpitation, shortness of breath, dizziness and insomnia, sweating when moving, white complexion on the left and light on the right, pale tongue, and weak pulse.

Flat nails: The deck gradually becomes flat with cross lines, such as tennis racket, wide and flat top, swollen nail groove, abnormally shortened distal knuckles, and normal tongue pulse.