Neurofibromatosis type 1 (NF1) is a genetic disorder characterized by the development of multiple benign tumors called neurofibromas on the skin, along nerves, and in other parts of the body. It is caused by a mutation in the NF1 gene, which affects cell growth regulation. Individuals with NF1 may also experience other symptoms such as café-au-lait spots, freckling in the armpits or groin, and Lisch nodules in the eyes.