The horizontal lines and depressions on the toenails may be caused by nail bed dysplasia, trauma, gray nails and other reasons.
1. Nail bed dysplasia: Long-term pressure on the toenails can cause nail bed dysplasia, which can lead to the phenomenon of horizontal lines and depressions on the toenails.
2. Trauma: Trauma to the toenail can also lead to the phenomenon of horizontal stripe depression on the toenail, mainly due to the root of the nail and nail bed damage caused by trauma.
3. Gray nails: Fungal infections due to poor hygiene or indirect infections can lead to gray nails, which can cause the phenomenon of horizontal indentation on the toenails.
If the patient has horizontal depression on the toenail, after excluding physiological factors, it is recommended to go to the hospital in time to find out the cause of the disease and then targeted treatment.