http://www.smartgroups.com/message/readmessage.cfm?gid=1423922&messageid=3039
 
>I have a 5 year old ferret who has been healthy his whole life.  I have
>been watching a small, pea sized area on his flank, next to his tail
>for several months.  It is non-itchy, and was like a recurring scab.
>I assumed it was a mast cell tumor, but thought as long as it wasn't
>bothering him - I'd just watch it.
>
>Yesterday, I noticed that it had ballooned up almost overnight.  I am
>now thinking it is an apocrine cyst as it is like a fluid filled blister
>with a weepy, raw area on the top of it.  Almost like a soft marble was
>inserted under the skin.  It is not attached to any of the structures
>underneath it and is fluctuant with fluid.  A gentle squeeze does not
>produce any drainage.
 
I agree with your presumptive diagnosis here, and I think we can probably
watch this one.  These tend to go up and down, but if it gets bigger, or
anchored to underlying tissues - it comes off immediately.
 
With kindest regards,
Bruce Williams, DVM
[Posted in FML issue 4031]