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Lift it up and see if it is attached by just a small bit of something, and then look for tiny legs near where it is attached. It kind of looks like an engorged tick. If it is, here are instructions on removing it.
You can remove a tick by grabbing it firmly at the head and gently tugging it away using a pair of tweezers until it separates from the bite site. Be sure and grab it at the head to prevent the head and body from separating. If it does separate, don’t worry, your dog’s body will attempt to dislodge it on it’s own. Your vet also has tools that are able to get it out if it really bothers you. Once it is off your dog, you can flush it down the toilet, or burn it. Treat the bite wound with peroxide and Neosporin. There are tick removal tools available on the web, which you may want to look into as they do make it easier to remove ticks.
If it isn't a tick, then it is a growth and you will need to have the vet examine it and possibly biopsy it. A lump may indicate cancer, but many such growths are harmless. Many lumps are not painful or bothersome. It may be a fatty tissue deposit called Lipomas or a wart or a hematoma, but to be positive your vet will need to test the lump to be sure.
Any lump found on your animal should be tested to determine if it is a cancerous or benign lump. Your vet will want to perform a fine-needle aspiration or other appropriate test. It is performed quickly and allows some of the cells of the lump to be evaluated by the veterinary pathologist. This test will allow the vet to determine the nature of the lump and take the necessary steps to remove it. Some vets will leave it alone if it is not serious. If it is an abscess, he may just drain it and prescribe antibiotics. Lumps that are solid feeling, feel attached and fast growing should be checked as soon as possible as these are the ones that are more likely to be serious.
Here are a few sites for additional information and pictures to allow you to get an idea based on the physical characteristics..
It may just be a papilloma as well or wart. You can read more on this here:
Hopefully this gave you some informaiton that will help you decide if a vet visit is in order. Hoping it is just a tick and won't need any further treatment.
I hope this information is helpful to you. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have . If you do find this helpful, please take this opportunity to rate my answer.