Hello. Thanks for writing in. My name is***** and I would be happy to help you. I am not set up to do phone calls but would be happy to answer any questions you do have online. In order to give an informative and concise answer, it may take a few minutes before I respond back to you, so don't be alarmed if you don't hear back immediately if you have responded back to me within 10 minutes of my response. I do have a couple more questions, though, to see if I can better assess your situation.
Does the lump seem to bother him?
Is it possible for you to take a picture of the lump and post it or attach it to your next message?
Thanks for the information and picture. It looks like the area is infected. It is difficult to tell from the picture, but that black area could be an infected cyst. The picture is a little blurry, though, and difficult to tell if it is all underneath the skin or a raised mass. If it is a raised mass that is firm and feels solid, I would be concerned about a tumor of some sort, such as a melanoma. Due to the inflammation around the area, though, it really looks infected. If the skin is just black and a little crusty there, it could be some necrotic skin due to a spider bite. I would have your vet check this out because it may need to be cleaned up or even debrided if necrotic. At the very least, he probablyl needs some antibiotics. Please let me know if you have any other questions or concerns. Hope this helps.
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You are very welcome. Let me know if you have further concerns.