First, RLS is classified as a "motion disorder" and is an uncontrollable need to move your extremities, can be arms but many just have it in their legs, when sitting down or sleeping. There are medications used in the treatment but the cause is ...as yet unknown.

I have another theory and again I am not a doctor so if you find this may pertain to you see a doctor and ask them about Getting Tested.

I think that if you have low blood pressure and a vitamin deficiency that you will be at a higher risk for RLS. That just as your body has the INvoluntary response to shiver when your cold, or when you have a high fever, to bring your body back to equilibrium it also may play a part in RLS. Specifically, that when your body's active a vitamin deficient person's cells are barely getting enough nutrients.  Then you slow your conveyor belt of nutrients getting to the cells and your cells start starving. In an attempt to speed up the conveyor belt, circulation, your body sends signals to your extremities to move which is the best way to increase blood pressure and speed of circulation.

If this vitamin deficiency, which may be due to a malabsorption issue, is left unchecked that it will most possibly lead to secondary disease processes.

About one week after I came up with this idea I read the below article. A James Connor of Penn State University in 2004 determined that some people with RLS have a vitamin deficiency, in this case iron, that was due to a lack of proteins that transport the vitamins.  It was a vitamin deficiency due to an absorption problem, for more details see URL below.  Again if you feel this may apply to you go to your doctor and ask about Getting Tested. 
http://www.neurology.org/cgi/content/abstract/61/3/304?ck=nck

I am adding this information to the RAMS website since my aunt, maid of honor in my wedding, has RA and Restless Leg Syndrome.  It seems many with RLS have other diseases which fits my theory that if you have low blood pressure plus a large deficiency your body will try to keep from starving, at the cell level, by stimulating movement thus increasing blood pressure.  If you have LOW blood pressure and deficiency then RLS will most likely be a precursor to a secondary disease process.
As for my aunt she has always had RLS but was only diagnosed with RA when she was around 50 years old. She is going to be tested for vitamin deficiencies and absorption problems by the end of July 2008.  I will post those results.

Eczema
If you are diagnosed with eczema, 9 to 10 the doctor will just say to use lotion. This is what my pediatrician said about my son's eczema too.  However, if you have eczema then you may want to read the below articles and take probiotics.  A product like GNC: Digestive Health Powder (1/4 scoop daily) the pro & prebiotics along with digestive enzymes help break down and absorb your food better so you get more nutrients going to all your organs... your skin being the largest and needing more nutrients stays healthier.  

I started giving my son Life Start is a Probiotic designed specifically for children under 4 years of age. It's made from Bifidobacterium infantis, the friendly bacteria most prominent in infants. It cleared up 80% of my son's eczema within a week!!! Note I had him tested for allergies but he has none.  I did reduce his milk intake from 4 large bottles a day down to 3 small portions and this seems to help to which makes since because milk makes your body pH acidic. As of the end of June 2008, about 4 months later, most days he is 90-95% clear of his eczema ( :

I also believe that IF your body's eczema is not caused by an allergy then body pH may be part of root cause because Probiotics have to be given every day.  If you stop then the eczema comes back which means the good bacteria (ie probiotics) used to absorb food are not surviving when they should. So ultimately people who suffer from eczema, that is not due to an allergy, either have a very acidic diet and/or they have and under or over active lung/kidney.  As it is the lungs that produce CO2 which is acidic and your kidneys produce HCO3 which is a base molecule. 

This was proved, at least to me, when even using probiotics I gave my son OJ for a few days in a row. The eczema around his neck was so red.  I figured the pH must be too acidic/low for the bacteria to survive.  I gave him about 1/4 teaspoon baking soda in his milk before he when to bed to raise his pH levels and make his system more base/alkaline.  By the morning the redness had when down from 9 to about 3 on a 1-10 scale.
I have not done this since because I don't give him OJ much anymore. Plus, you do have to be careful of baking soda overdose as it can cause sugar diabetes.

FYI Normal pH of blood 7.34, saliva 7.4
pH scale 0-6.9 = acidic  7.0 = neutral  7.1 & above = base / alkaline
Veggies & non-citric foods make your blood more base/alkaline    
OJ, cranberry juice & MILK make your body pH more acidic.

So eating more alkaline food, less acidic food and taking probiotics should help. Again, if your sure an allergy is not causing your condition.  Fish oil has also been found to promote good skin health.

Please see your physician and find out if Probiotics can help with your eczema. If you would like to read one of the research articles on this topic click on the links below:
http://findarticles.com/p/articles/mi_m0ISW/is_2003_May/ai_100767858/pg_3?tag=artBody;col1 
Skin health, eczema, and preventative strategies: Townsend Letter for Doctors and Patients.  May, 2003  by Chris D. Meletis,  Jason Barker

http://www.eczemamembers.com/clubportal/ClubStatic.cfm?clubID=745&pubmenuoptID=7016
Bacteria and Eczema:   Eczema is an Immune System Disorder (atopy), and 75% of your Immune System is found in your Gastrointestinal Tract where 3 to 4 pounds of bacteria reside.