That sounds pretty classic for a mast cell tumor which are a very different -- and much better -- situation for ferrets than they are for dogs or cats except in the incredibly rare situations when they are on organs like intestines rather than as skin tumors. See this veterinary resource to learn more and accurate information on this form of histamine producing growth: http://www.afip.org/consultation/vetpath/ferrets/Mast/mastcell.html <http://www.smallanimalchannel.com/ferrets/ferret-health/tumors-in-ferrets.aspx> There are certainly other skin growths to learn about, and every one should learn about typical ferret health problems before they arise if at all possible. See my sig lines for resources for info on a range of health concerns. Another vet experts on mast cell tumors IN FERRETS: http://www.peteducation.com/article.cfm?c=11+2061&aid=2588 Sukie (not a vet) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/ http://www.ferrethealth.msu.edu/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html all ferret topics: http://listserv.ferretmailinglist.org/archives/ferret-search.html "All hail the procrastinators for they shall rule the world tomorrow." (2010, Steve Crandall) [Posted in FML 6745]