What's with the black stripes on the vertical stripes of this nail? Look, can it disappear?

There's no need to be nervous. It's normal. It is estimated that it will disappear in less than a month. There are many reasons for this black nail pattern, but most of them come from the external environment, which has little to do with physical function and health, let alone health or physical abnormality. If your fingernails are invaginated, you should pay attention. Indentation may be a health warning, but black nail marks have nothing to do with health. If you are not at ease, you can consult a doctor in a local regular hospital. Such consultation does not require registration. I hope my answer is useful to you!