First of all, it is normal for the nail to be significantly separated from the nail bed if the patient has had significant trauma to the toenail. This condition is often transient and can heal slowly with the absorption of the local bruising and does not require special treatment. However, if the nail is not obviously traumatized, and the nail bed is clearly separated from the nail, and there are some morphological changes in the nail, you should consider whether you have a fungal infection. It is common to see nails that are separated from the nail bed, or sometimes appear to be hollow underneath. In this case, it is best to go to the dermatology department of a regular hospital, and in addition to observing the external symptoms, a mycelial examination should be performed to further confirm the diagnosis.