It would be very difficult to say what this lump is without seeing it, and feeling it. Does your pup wince when you touch the lump, or is it reddened and looks inflamed? If so it could be an abscess.
It could also be a swollen lymph node.
I obviously can't say for sure, but if it is very rounded and smooth, especially if it seems 'mobile' (moves quite freely under the skin) it sounds like a cyst, and is most likely benign.
However please don't take my word for it, as some cysts are problematic, and also,a small percentage CAN turn cancerous later if left.
Always the best idea....get the lump checked out with the vet.
My dog has a number of lumps and little cysts etc, which she has had for a while. I always keep an eye on them as the vet asked me to do. None have grown, some have disappeared! But every time I did discover a new lump on her I took her straight away for it to be investigated just to be on the safe side.
Copyright 1994-2018MedHelp.All rights reserved. MedHelp is a division of Vitals Consumer Services, LLC.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.