**Identification and treatment of nail nevus in children** A female nail nevus is a pigmented lesion that forms in the blastoblastic area of the fingernail or toenail (that is, under the nail bed). In children, nail moles usually appear as one or more brown or black lines under the fingernails. This condition can be caused by trauma, infection, or other causes. ### Description of the condition Based on the condition you described, your child has developed a long brown line under his fingernails and this has been going on for several months. Although nail nevi are usually benign lesions, they should be alerted to a possible risk of malignant transformation. ### Doctor's advice 1. **Initial Evaluation**: It is recommended to go to a specialized dermatology or pediatric hospital for a detailed examination to ensure the nature of the lesion. Your doctor may use a dermoscopy or other imaging tools to do the test. 2. **Pathological examination**: If the doctor suspects, he or she may recommend a pathological biopsy to determine if it is a benign lesion. Typically, a nevus is benign, but malignant melanoma should also be ruled out. 3. **Regular monitoring**: If a female nevus is diagnosed, regular follow-up is recommended to observe whether there is any change in the lesion. If the pigment lines become wider, darker, or have other unusual changes, you should seek medical attention immediately. 4. **Treatment Options**: For asymptomatic cases with a confirmed diagnosis of benign nail nevus, no specific treatment is usually required. However, if it is cosmetic or there is a risk of malignant transformation, your doctor may recommend surgical excision. ### Prevention & Care 1. **Avoid trauma**: Try to avoid injuries to your child's fingernails to reduce the risk of pigmentation and infection. 2. **Keep it clean**: Clean your child's fingernails regularly to keep them dry and avoid bacterial growth. 3. **Seek medical attention in time**: If you find that your child's nails are abnormal, you should consult a professional doctor in time to avoid delaying the condition. In conclusion, nail moles are more common in children, but parents and doctors still need to pay attention to ensure the health of children.