Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today.
At the site of the hair loss, are you seeing any changes to the skin (ie redness, ulcers, sores, pustules, pimples, crusts, or scabs)?
Does the area seem itchy?
To allow me to see what you are seeing here, could you take a photo of this? If you can do so and post them online, I am happy to have a look. To post them, you can either use the wee paper clip on the tool bar. Or you can post them on a 3rd party site (ie Flickr, Photobucket, Imgr etc) and paste the web address here.