I was petting Vicket who is my elderly girl, and noticed on one side of her muzzle where a whisker used to be rooted she has a tiny furrless patch of skin, like a lesion. It's dry, not swollen or infected, she's happy to let me rub and stroke it and her teeth and jaw are ok, so nothing around there hurts. She's eating well, and I gave her dried food to double check her teeth, she's munching biscuits happily on that side. Does anyone know what this might be, or should we head to a vet and get this looked at? Because she's elderly I tend to panic at any potential sign of trouble, but she seems fine and lively in herself.