What causes a painful, crusty, circular irritation on a dog's ear?

Thank you for submitting your question regarding your dog. I recommend that she sees her veterinarian. The ear could have a small mass that has now become infected. The leg appears to have an elbow callus. Her veterinarian will determine if this is the case. If a mass is present on the ear, it may require surgical removal. If it is a wound, then antibiotics could be needed. If the limb has a callus, treatment is generally not required. I hope this information helps!

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. Judging by your description, it sounds as though Shiloh may have a skin infection or seborrheic dermatitis possibly. Without pictures and not being able to examine the area myself, it is difficult to say for sure. I would recommend having a veterinarian examine Shiloh so that the most appropriate diagnostic and treatment recommendations can be made. Shiloh may need an oral antibiotic and topical therapy for treatment. I hope this helps guide you in the right direction. Please let me know if you have any other questions or concerns and I would be more than happy to help you further.

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be due to allergies affecting just the skin of the ear or even also causing an ear infection. This warrants a visit to your veterinarian. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

It looks to me like something more serious could be going on, although it can be difficult to tell from a picture. Sometimes vasculitis can cause discoloration and poor blood flow to the tips of the ears - this would need a biopsy for a definite diagnosis. I would recommend rechecking with your vet.

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Milli Rock. It could be she has an ear infection causing the redness and crusting spot. It would also cause her to itch her ear. Ear infections in dogs can be caused by ear mites, yeast, or bacteria. She does need to see a vet to have this diagnosed and treated. Leaving this untreated can lead to hearing loss. Give her vet a call to make her an appointment. I hope this helps!

This presentation could be due to a localized spot of skin infection (likely to be caused by bacteria). This type of skin infection is commonly called hot spot. A check up, appropriate disinfection and antibiotics (oral, topical or in a shampoo formulation) are needed to solve the problem. Disinfection may be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid any licking/scratching. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. If this answer was helpful please let us know, this will be used to improve our service!

Please do not use Sudocrem, as it contains zinc oxide, which would be toxic if she ingests it. If there is a bacterial or yeast infection present in the ear canal, which may be the case especially if she's shaking her head and scratching, you should have your vet examine her. Some ear solutions and medications can damage the middle and/or inner ear if the eardrum has been damaged. Your vet will likely be able to see the eardrum when he or she uses an otoscope to look in the ears. Sometimes the canal is very swollen and /or has a large amount of debris that prevents us from being able to see the eardrum, but we should always attempt to verify that the eardrum is ok before treating the ear, so as to not damage the middle or inner ear. If she does not seem to be shaking or scratching, it may be just the pinna (ear flap) that is affected, in which case I would recommend you try using [Zymox](https://www.petco.com/shop/en/petcostore/product/zymox-spray-with-5-hydrocortisone), as it may get things cleared up. If you aren't seeing improvement in 3-5 days at home, take her to the vet. Thanks for asking PetCoach!