I occasionally get a hot flushed face, my skin feels tight during this, it takes around 30mins-1hr to go away. Once redness goes my skin feels tender?

Diagnosis first. Hi, it’s hard to say without a picture but there is a great app that may be able to help you get a diagnosis without being seen in person by a dermatologist. The app is called VisualDX and is one of the best, if not the best out there. Many clinicians, including myself, use it. Just snap a photo and it gives you a list of possible diagnoses. Good luck!
Carcinoid . Recommend TSH, Free T4, 24 hrs urine for 5-HIAA.