A number of studies suggest that Psoriasis and Celiac disease share common genetic and inflammatory pathways.
Psoriasis is an autoimmune condition affecting the skin.
With psoriasis, the immune system attacks cells known as keratinocytes in the outer layer of skin (epidermis).
Inflammation is a natural process that happens in the body. However, in the case of an autoimmune condition, that inflammation process does not switch off.
In psoriasis, inflammation causes certain skin cells to grow too fast, causing the cells to pile up and form thick, itchy patches, called plaques.
A 2014 study in the Journal of the American Academy of Dermatology reported that, among 33 people with psoriasis who had high gluten antibodies, nearly three out of four (73%) experienced an improvement in their skin symptoms after going gluten-free.
The National Psoriasis Foundation (NPF) believes that the jury is still out as to whether a gluten-free diet is a viable treatment for psoriasis.
Psoriasis is also greatly affected by stress. The conclusion is that both CD and Psoriasis are autoimmune conditions which share some genetic factors.
There is an indication that a GF diet may assist with Psoriasis.
sources:
https://doi.org/10.1111/j.1468-3083.2008.02713.x