Gluten is indeed an ingredient in beer.  Most beer is made from barley.
  Gluten grains are wheat, rye, barley and possibly oats (through
cross-contamination).     A few companies now make gluten-free beer.

To follow up the other discussion, there is a skin condition called
Dermatitis Herpetaformis (DH) that is basically Celiac Disease (CD)
presenting as a skin condition.  People with DH always have CD, but
people with CD do not necessarily have DH.    DH is diagnosed through a
skin biopsy, but intestinal damage is almost always found(even if
people have no intestinal symptoms), so a biopsy & endoscopy is often
done.

I am a firm believer that our bodies react in many ways to what we eat.
  I had never felt better than when I went on a gluten free diet...UNTIL
  I went on a paleo diet.  Wow.  I feel amazing as long as I stay 100%
paleo AND gluten-free.  It's tough to maintain this food lifestyle here
in the USA, though!

best wishes,
kathleen