Hi there!! I use Clearasil pads on Mochas chin when needed. Could it be a bug bite maybe?The reason I ask its because is on his neck. I recomend you use Sulfodene. I love this stuff. You may get it online or at your local petstore(Petco has it).Clean the area an apply a little on it. You can also use neosporin on it. I bathe Mocha with Viva La Dog Spa oatmeal shampoo. Its gentle and soothing on her fur and skin, but any oatmeal base shampoo would work great also.