Why is my dog's red bump on her side getting bigger and redder?

There are a few possibilities as to what this could be on Ruby. In a younger dog benign masses called histocytomas are possible. These generally regress with time. However, masses like mast cell tumors can also present this way. Mast cell tumors can be problematic and need to be surgically removed. Mast cell tumors also release histamine so please do not continue to try to squeeze this growth. Some other causes of this (although probably less likely) are cysts or infections. I recommend taking Ruby to see your veterinarian so that a sample of cells from the mass can be obtained. This will help in diagnosing the growth and in deciding if it needs to be removed surgically. Thank you for using Petco Pet Education Center, formerly Petcoach and I hope this turns out to be a benign issue for Ruby.

Hello and thank you for your question. I recommend to have your pup examined by the veterinarian. Skin masses can be many things but red/pink raised masses are especially concerning for a skin cancer called a Mast Cell tumor. This cancer can spread to the internal organs. Your veterinarian will need to collect a sample of cell to examine under the microscope to determine what this is and if further treatment is needed. Have this checked out soon. Fingers crossed this is not a MCT and is something benign instead but you can't tell by looks. I hope this helps.

Unfortunately there is no way to tell what that is just by looking at it. It could be a benign or malignant growth. I am concerned that it could be a mast cell tumor and I recommend having Lexi examined by her veterinarian. They will take a sample with a needle and examine it under the microscope to determine what it is and what treatment is needed.

Thank you for using Petco Pet Education Center, formerly Petcoach! Kona does have what appears to be a small, round, red and slightly bloody bump on her lip margin. This can be caused by an infection, which may have resulted from a small cut. While Kona is pretty young, it is possible that the bump is a small tumor, and it can be removed to determine if it is benign (not harmful) or malignant (likely to spread). It is concerning that the bump has gotten bigger over time, so I recommend having her seen by a vet. You can get her an E-collar or "cone" to prevent her from scratching or rubbing the area. I hope this helps!

Poor girl! This could be a number of things from a benign tumor, an infection, a cancerous tumor and much more. I would first put a cone collar on her to prevent her from licking it or it will only get worse. Since the bump is really swollen and obviously bothering her, I would have your vet take a look at it. Your vet will be able to determine what it is and recommend the best treatment for her. They will likely put her on antibiotics and may or may not recommend to have it surgically removed. I hope this helps!

It could be that the bump has turned into an abscess, or localised infection. Do you have any pictures that you could post ? Given the fact it does not affect him that much, if he is still well in himself , I would book him in for a check up after the week-end, sooner if becoming lethargic or not eating or even restless scratching at it. Have you tried to clean it gently ? Feel free to contact us in a consultation with pictures or just post pictures here.

I'm not sure from the picture if it's just the mass the side a little bigger than your thumb nail, or if the entire 6 inch round area around the main bump is red. Either way, I would be worried about a growth first and then perhaps an insect bite if you've only noticed it today. Young dogs can have a type of mass called a histiocytoma that is benign and goes away on it's own eventually. I would recommend a vet visit if it's growing in size, just to be on the safe side.