I was diagnosed with ITP at the age of 16. It's most common in children where it usually goes away between 6 weeks and 6 months, but it does occur in adults as well where it usually is a chronic condition. ITP is an auto-immune definiciency disorder which makes your body destroy your own platelets. In other words, a bleeding disorder. I hate to be the bearer of bad news, but there is no known cause for ITP, and therefore, there really is no cure. There are several different treatments including Prednisone (corticosteroids), WinRho and IVIG (blood fusions), and others including splenectomy (removal of the spleen) for the most extreme cases. IIP can usually be identified by low platelet counts, but also includes: bruising easily, petikiai (little red dots on the skin), and fatigue.
I would recommend your husband see a hemotologist, it'll help. Another thing that helped me, and may help you, as a loved one, is the platelet disorder support association. THis organization was started by a woman with ITP, and it really was a lifesaver during the first years since my diagnosis because of all the information and resources available. The website is great.
I also want to give a word of advice, I had taken Prednisone, done different blood fusion treatments, and was even at the risk of having my spleen removed until I started using natural medicine. Now, I'm not saying that the Prednisone didn't work on occassion, but I was really done with having crazy side effects. I'm also not saying every natural medicine works because I tried a lot of different ones that didn't, but then I found Transfer Factor. I currently take Transfer Factor and have been in remission since I started taking it two years ago. It is an amazing product, and if you would like more information feel free to write me.