The specific causes of small sarcomas on the neck of patients are as follows: 1. Fibromatous hyperplasia: It is possible that patients have fibromatous hyperplasia in the neck area, mostly seen in soft fibromas of the skin arising from the neck, which is a benign hyperplasia, the cause of its formation is not very clear, but it is not harmful to human health, so it usually does not require special treatment. The actual fact is that you can find a lot of people who have been in the business for a long time.