Fingernails are rough and have indentations, what's wrong?

Patient's question:

Daughter, 8 years old, the big thumb nails were found to be rough one year ago, with transverse grooves, especially deeper longitudinal ones. The nail root does not grow firmly with the flesh. Other nails are normal. Nutritional and trace element tests are normal. Please let the experts take a look. What is this, how to treat it

Doctor's answer:

Indicating malnutrition and a lack of protein and calcium. At this time, minerals are also extremely deficient. It is recommended to go to the hospital for a check-up. On the other hand, it could also be caused by a skin disease, and fungal infection is also a possibility. You can eat more iron-rich and red-colored foods to regulate it. It's not a serious condition, and you can also use Compound Ketoconazole Ointment, which is primarily used for treating skin infections. Apply it externally to the affected area once in the morning and once in the evening.