It is against forum rules to ask for or give medical advice. Someone could very easily give you the wrong information, which would delay a real diagnosis and cause further harm to your dog. Please have your dog seen by a vet, and then you can start a new thread to discuss the diagnosis.
Many vets will also allow you to send a photo of the problem so they can tell you whether you should bring them in or not. This is typically free of charge.
Many vets will also allow you to send a photo of the problem so they can tell you whether you should bring them in or not. This is typically free of charge.