Facial Flushing and Carcinoid Syndrome – Verywell Health

Carcinoid syndrome is a group of signs and symptoms that are associated with tumors of the enterochromaffin cells, a type of neuroendocrine cell found in the gastrointestinal tract. When rare cancerous tumors called carcinoid tumors secrete certain chemicals and hormones into your bloodstream, they cause a variety of symptoms.

https://www.verywellhealth.com/facial-flushing-caused-by-carcinoid-syndrome-1069266