It just appeared a couple of days ago. Its whiter then the rest of her ear. It doesnt bother her at all, and the area does not look swollen. Just a small, rather hard bump. Should I take her to the vet?
The vet said: I suspect that it may be fly strike dermatitis. The tips of the ears area is a common place for flies to bite on cats. It doesn't necessarily have to be itchy. Ringworm is also another strong possibility, especially if there is hair loss and some scaling or crusting involved. That is also very common in cats and is usually not itchy. Have your vet check this out. I would probably get a skin scraping to make sure it is not mange as well. Usually, sarcoptic or notoedric mange is itchy. Demodectic may or may not be itchy in a cat. A deep folliculitis (bacterial infection in the hair follicles) is also possible, but it is usually secondary to one of the other issues listed above.
I agree with Steph. Even indoor cats can get these things. They come in on air drafts, on the soles of your shoes or with visitors who may have been exposed. I would ask a vet, particularly if you suspect ringworm as it is very contagious and can be passed to humans, and believe me, you do not want to get it!