How long has it been present and how large is it?
About 1 month and it is very small. Started off as a pin head and now not much larger but definitely grown a bit. It also looks as if the red on it is where she may have caught it again on something.
Ok, slow growing is good. Warts are common in older dogs, as are skin tags. Both are benign and don't need any treatment unless they are being repeatedly traumatised for some reason. In that case the usual (and only) solution is to surgically remove them. Often this can be done just under a local anaesthetic, although in the nose region (which is especially sensitive) it may be better to have a light sedation as well.
Many thanks. I will keep an eye on it and see how it goes. If it gets bigger, or looks as if it may be causing her discomfort, I will take her to the vets.