When you say that there is "leakage", I'm not sure if you mean just sweat or somthing else. I still believe this may be the problem. I would recommend that he see a physician familiar with these problems - most likely a dermatologist or a surgeon.
If this is NOT the problem, then he may just have hyperhidrosis a condition of just excessive sweating - there are number of things that can be tried for this including Botox injections.
http://www.cfpc.ca/cfp/2005/Apr/vol51-apr-clinical-4.asp
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