If the mastocytosis you're referring to is the rash that pops up after gluten exposure I would first consider dermatitis, eczema, psoriasis or unfortunately dermatitis herpetiformis. I personally seem to have dh and dyshidrotic eczema. Thrilling.
If they (a dermatologist) is going to biopsy the rash for mastocytosis you need to request a separate biopsy to determine dh. They can't use the same sample used for other tests like mastocytosis. Read this: http://www.arupconsu...petiformis.html
The good news about the rash may be, if biopsied correctly and it is dh, you will finally put the question of celiac v. ncgs to rest....since dh is celiac disease.
Hmm... That is certainly something I need to look further at.
The reason mastocytosis is on the table is not due to the acne-like rash, but the fact that my most recent stomach cramps/pains have been disproportional in severeity (I will nearly loose consciousness from the pain) to the possible gluten I might have been exposed to (I am very vigilant regarding my diet), while at the same experiencing throat itching, hives and lightheadedness/dizziness.