According to the Gluten Free RD:
"People with DH present with varying degrees of intestinal damage, but may not experience GI symptoms."
Besides being important for your own health if you have this symptom other family members might be affected with silent celiac and suffer from chronic health conditions related to gluten--so pinpointing whether it is in fact DH is important for everyone.
In NYC, you should contact the Celiac Disease Center at Columbia to get tested for celiac--a condition often missed by many mainstream doctors. Here is the contact information for getting tested...
180 Fort Washington Avenue
New York, NY 10032
Tel (212) 342-4529
Fax (212) 342-0447
Here are resources:
Ask the Gluten Free RD: What is Dermatitis Herpetiformis