My ( limited ) understanding of lichen sclerosus is autoimmune with a possible connection to thyroid disease where as Dermatitis Herpetiformis ( DH) is an autoimmune disease associated with celiac disease .
It would be possible to have both lichen sclerosus and dermatitis herpetifomis at the same time
And yes it is very possible to have DH ( celics) with a neg blood work and endoscopy
I am curious where you found the information that lichen sclerosus is connected to thyroid disease. I have lichen sclerosus and my thyroid tests have all been normal and all of my problems are skin and joint related. When I gave up gluten, my lichen sclerosus went into remission over time, I no longer get rashes, and my joints no longer feel stiff when I wake up in the morning. I want to make sure I keep up on my health so I am interested in any relation between lichen sclerosus and thyroid since my thyroid has been tested to be normal. Thanks.