Children with black gums may be caused by nevus pigmentosus, heavy metal poisoning and other diseases, as follows.
1. pigmented nevus: a benign tumor of melanocytes, most of the lesions are not more than 0.5 cm, high up or not high up on the surface of the mucous membrane, and its source may be the migration of neural crest cells to the epithelium and epidermis, or from the residual melanocytes.
2. Heavy metal poisoning: Excessive heavy metal content in the body can lead to heavy metal poisoning, such as lead poisoning, bismuth poisoning, mercury poisoning, etc., which may result in the formation of blue-black pigmented areas on the edge of the gums, leading to black gums.
Children with black gums may have other reasons, it is recommended to go to the hospital in time, clear cause for targeted treatment.