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The lump does not appear to be painful to him at all but does appear to have some discharge. It is very red but not bleeding.
He is a 5 year old Cairn Terrier.
The mass is red and the discharge is clear. In the past 30 minutes it has gone from a small grape to a more of a oblong looking mass, basically putting two grapes together. I just took a picture but it say's it is too large to attach. I could email it to you if you provided an email address.
Thanks. I can't receive it over email, but can you post it to a file sharing website and make sure I have access? It seems to be growing awful fast to me.
I would agree that it is growing awful fast which is why I used this option online. I will just get him to a vet in the morning.
With the mass growing so fast and having a clear discharge, I would suspect it is some type cyst. If it was bleeding, the discharge would definitely be bloody. Even a cancerous tumor would not grow this fast. Besides a bleeding hematoma, a cyst would be the only thing that would grow this fast. Most cysts just develop for no reason at all, although trauma can play a part in some of them. Usually cysts are benign but can get infected. If not painful, I would try applying a cold pack to the swelling for 10-15 minutes to see if you can get it to stop increasing in size. If it stops growing and it not bothering him, just keep an eye on it tonight and have your vet check it out tomorrow. If the mass keep growing tonight and is getting really large, you might want to have your nearest emergency vet take a look at it. Although these conditions are rarely an emergency, it may rupture and get messy if it continues to grow. Please let me know if you have any other questions. Hope this helps.