“…Other rare causes of flushing include sarcoidosis, especially the lupus pernio variant, wherein the diffuse granuloma underlies dilated blood vessels 1 ; mitral stenosis, which may cause a malar flush with cyanosis due to an uncertain mechanism 4 ; ''dumping syndrome,'' a constellation of facial flushing with tachycardia, sweating, dizziness, weakness, and gastrointestinal disturbances that occurs in patients after gastric surgery upon ingestion of food or hot fluid or upon infusion of hypertonic glucose 1,8,90 ; androgen deficiency in men after testicular injury, after orchiectomy, or due to pituitary tumor 91,92 ; acute arsenic intoxication 93 ; POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, monoclonal proteins, and skin changes) 94 ; basophilic granulocytic leukemia, via increased histamine production and associated with symptoms of wheezing, urticaria, diarrhea, and pruritus 6,95 ; bronchogenic carcinoma, possibly via overproduction of adrenocorticotropic hormone 96,97 or VIP 6 ; malignant histiocytoma, neuroblastoma, and ganglioneuroma, wherein flushing also may be related to increased production of VIP 6 ; postherpetic gustatory flushing and sweating in the distribution of the scarred trigeminal nerve 8 ; surgeries in the periaortic region that involve traction on the mesentery and thus may provoke prostacyclin release 7,98 ; Leigh syndrome, also known as subacute necrotizing encephalomyelopathy, which may have a prodrome of flushing that turns to pallor, sweating, drowsiness, lethargy, and restlessness, and is associated with increased levels of endorphins in the brain and spinal fluid 6 ; and Rovsing syndrome in patients with horseshoe kidney that may present with flushing, abdominal pain, and nausea, all of which are relieved by the anteflexed position. 6,8 Flushing may also be a feature of homocystinuria, 99 which typically presents with malar flushing, and of hyperthyroidism.…”