My dog's neck lump grew, turned black and crusty. What could it be?

This lump on Johnstamos (LOVE his name!) could be a cyst, a benign tumor, or a malignant tumor. Because it has tripled in size, that does make it concerning. Any suspicious lumps should be examined by the vet. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. As for the scabby and crusty ears, those could be due to an ear infection or allergies. Give his vet a call to make him an appointment to have both these things checked out. I hope this helps!

A small area like this could be inflammation as a result of an insect bite or wound, inflammation as a result of bacterial infection (though usually we would see more then just one lump) or a growth/tumor of the skin (we can have benign growths that don't cause any health concerns or growths that are malignant and require removal). Unfortunately without an exam and a sample (taken with a needle most often ) we can't tell you for certain the cause. If it isn't bothering your dog I would continue to monitor it daily. It is from an insect bite or wound it should resolve over the next couple weeks. If it is still there in a month or is increasing in size or changing appearance then a vet visit to investigate the area further is warranted.

It is difficult to know what the initial lesion was, an insect bite, a skin growth, or a place where his collar has rubbed and irritated the skin are all possible causes. I would do the following; Replace his collar with a chest harness to let the area rest Clean the lump with warm water and then leave open to dry Measure the lump with a ruler In 2 weeks measure the lump again. Check for growth, changes in texture, colour or bleeding. If you notice any of these then I would advise a check-up at the vet.

I would not be overly concerned about this but continue to monitor closely for any further increase in size or change in colour. Many small wounds, cysts and blocked glands will develop into small, firm noduels and most will harden and shrink down uneventfully. Any changes should be assessed by your vet however

A black crusty lump could be a sebaceous gland tumor (usually benign), a papilloma, or a cancerous mass. Skin lesions can sometimes be identified just by looking at them. Do have your vet or one of the experts here to look at it first. If it can't be identified then having this mass biopsied and analyzed will lead to a proper identification. I hope this helps!

It is hard to tell from the picture what these could be. Sometimes growths of the oil glands in the skin can appear this way. Infection can also be black and crusty. Melanomas can also appear as black growths on the skin. I would recommend that you take her to see your veterinarian so they can take a sample to diagnose it so that you know what it is and what needs to be done about it.

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.