A horizontal ridge protruding from the nail cover may be caused by chronic nail groove inflammation, trauma, nail psoriasis and other diseases.
1. Chronic onychomycosis: the cause is related to bacterial infection, long-term exposure to irritants and other factors, and the nails will show changes such as discoloration, bulging and grooves.
2. Trauma: If the nail has suffered from external impact or extrusion, it may cause damage to the nail bed, and the nail may have raised horizontal ridges after recovery.
3. Nail psoriasis: It is caused by the extension of psoriasis lesions to the nails, and the nails will show changes such as depression, separation, longitudinal ridges and transverse grooves.
There are many clinical reasons for a raised horizontal ridge on the nail cover of the patient, and it is recommended that the patient go to the hospital for examination to clarify the cause of the disease.