May be suffering from onychomycosis, commonly known as onychomycosis, the disease will spread by itself, please take the time to treat. This kind of disease is stubborn, and it is best to treat it under the guidance of a doctor (I'm not sure, let's check it out) (this is what another netizen said, and I think this is more reliable. You can try to cut off the separated nails, pay attention to cut off the separated nails, don't cut them completely to avoid necrosis and give them a long time, be careful not to touch dirty things, and it is best to wrap them for a long time)
If it is not the normal color, it may be onychomycosis.
You'd better cut off all your nails. It won't hurt if you cut them off now. Growing back should be healthy nails)