My dog has a head lump for a year, now with a black hole. What is it?

It looks suspiciously like a tick...... They don't usually disappear but they can get bigger or smaller depending on how much they are feeding. If it is not a tick then it is either a cyst or a tumor. I suggest you get him to a vet for an exam since it has been there so long already. Best wishes.

This lump needs to be checked and analysed as there are many conditions and types of tumors that could look like that. take her to the vet, they will perform a fine needle aspiration on the growth and send it to the lab for analysis. when the result comes, the vet will advise what needs to be done according to the diagnosis.

You should give the antibiotics a couple days to work, i am hoping that by Sunday you will start seeing some improvement. if by Monday it is not getting better take him back to the vet, it might need to be opened surgically in order to drain the fluids that are accumulating on that spot.

Thanks for using Petco Pet Education Center, formerly Petcoach! This does not mean that he is getting cancer necessarily. It could be a change in pigmentation. The lump may be a benign or malignant growth. This could even be an infection. This cannot be completely assessed just by looking at pictures or a description and usually requires sampling such as fine needle aspiration to determine its origin. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good day!

This may be a cyst or a tumor, or a pimple (little abscess). You should have it examined by your veterinarian as tumors should be removed ASAP, especially if they are of a black color. An abscess can usually be treated with antibiotics and/or be lanced, and a cyst can be evacuated. Your vet may want to do a fine needle aspirate (he takes some material from the bump with a needle and then looks at it under the microscope) to determine whether the mass is concerning. You can also watch it for a few days and see whether it goes away again. I don't think it is anything terribly worrisome.

This lump requires ideally an immediate check up to determine its underlying nature. Given the treatment failure it is unlikely to be caused by an infection, and differentials would include skin cysts and benign or more malignant type of tumors. Your vet will probably take some samples from it to analyse the type of cells in it.

This looks like a typica skin wart/skin tumor or cyst. Since it has been present for so long and has not grown at all, it is probably benign (non cancerous). It looks as if the area has been irritated somehow, probably by your dog scratching at it, and is now bleeding and may be infected. Or, if it is a cyst, the white material may just be cystic exudate. I would recommend cleaning the area with some dilute hydrogen peroxide then applying some antibiotic ointment to help prevent infection and to help it heal more quickly. Occasionally these need to be removed but only if they are a constant source of irritation or infection for the dog. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck!