Black vertical lines on the thumb may be caused by malnutrition, trauma, onychomatous nevus, onychomelanocytic tumor.
1. Malnutrition: black vertical lines on the thumb have a certain relationship with malnutrition. If the patient has the problem of picky eating, often eat some unhealthy food, then it will make the body lack of certain nutrients, such as vitamins, which will make the thumb nail area appear black vertical lines. You should eat more vegetables and fruits that contain vitamins in your daily life.
2. Trauma: nails are subjected to violent extrusion or chronic injuries continue to stimulate, resulting in bruising under the nail, the formation of black vertical lines, generally do not need to deal with, can be slowly absorbed over time to disappear.
3. Nail nevus: this disease is characterized by the appearance of a brown or dark brown longitudinal strip under the nail, extending from the root of the thumb to the tip of the nail, usually without pain, itching and other self-conscious symptoms.
3. Nail melanoma: black vertical stripes will appear on the thumb, accompanied by nail ulceration and secretion of blood-like secretion, the disease progresses faster, and requires timely diagnosis and treatment in the hospital.
Hand hygiene should be strengthened in normal life, and don’t often contact with bad substances. In addition, you should also develop good eating habits, reasonable combination of diet and nutrition. In addition to these factors, we can not rule out that there are other causes, we recommend that patients seek medical attention to clarify the cause of the disease, and follow the doctor’s instructions for standardized treatment.