Nails with horizontal indentations may be due to nail trauma, nail dystrophy, nail lichen planus and other diseases, according to the specific causes, targeted use of topical drugs, oral medication and other treatments. 1. Nail trauma: Nail trauma can lead to symptoms of horizontal indentation of the patient’s nails, this situation will generally be naturally improved with the growth of nails, do not need to worry too much. 2. Nail dystrophy: Nail dystrophy can also lead to symptoms of horizontal indentation of the nails, which should be treated by avoiding frequent contact with water and detergents, and supplementing with vitamins and trace elements as prescribed by the doctor. In addition, for patients with eczema and other diseases, you can also follow the doctor’s instructions to use dexamethasone ointment, tacrolimus ointment and other drugs for treatment. 3. Nail lichen planus: Nail lichen planus is a kind of idiopathic inflammatory dermatosis, if the disease involves the nails, it can also lead to the symptoms of nail transverse indentation, the treatment of which can be prescribed by the use of retinoic acid ointment, fluticasone propionate ointment and other drugs for treatment. In addition to the above diseases, other factors can also lead to the symptoms of horizontal indentation of the nails, it is recommended to consult a doctor in time to identify the cause and ask the doctor to deal with it.