NAC for the treatment of Plantar Fibromas / Plantar Fibromatosis / Ledderhose Disease:
This may turn out to be something that can be used in the future, but as far as I can gather not much is being done at the moment and it seems that it is being taken orally which can have numerous side effects whilst perhaps if it could be made into an effective gel and used in a similar manner to Verapamil it might prove more effective.
(1) Juergen Kopp et al. "N-Acetyl-L-Cysteine abrogates fibrogenic properties of fibroblasts isolated from Dupuytren's disease by blunting TGF-β signalling" J. Cell. Mol. Med. 10 (2006) pp. 157-165.
(2) International Dupuytren's Society study into the use of NAC to treat Dupuytren's and Ledderhose.