Go over to the companion support group at:
http://health.groups.yahoo.com/group/colon_cancer_support/
and Under "Home" (left column) click on "messages".
In the little box headed by "Msg # " put in 5904 and you will
get "Cliff179" message #5904 titled "Mouth Sores" which suggests
taking L-Lysine. Hope this helps.
Best
Ed