Hi! My brother had a red doby that got a bad sunburn and eating from a plastic dish created an infection and took on the appearance like your dog has. HOWEVER, that is not always the case. Since she is 4, I would take her to the Vet for a wellness checkup when you have the monies and have her checked over carefully. She may had an injury since she complained of soreness or she may have had a granulation tissue issus. Since she may have torn it, if should of healed backed unless an infection damaged the tisssue. I think waiting a few more weeks will be fine, call the Vet now to make an appointment and tell them what happened. You could try using Bag Balm as another Expert pointed out. It works wonders on dry noses. Also, you might ask the Vet to do a blood workup just to rule out thyroid or anything else. If you have any other questions, please ask.