Research performed in Canada suggests that the routine practice of qigong, a form of meditative movement, can help lessen the pain.
http://www.youtube.com/watch?v=bSZq78t4WMg
http://www.nydailynews.com/life-style/health/qigong-chinese-yoga-mainstream-article-1.1418040
Please offer more details regarding your brother's allodynia.
Exact location of pain, intensity, triggers.
How and when it started, tests, other medical conditions, accidents, surgery,
traumatic past events, stress and anxiety, etc.
Best wishes.
Niko