I medicated my dog rash, medicine and rubbed his skin off, it turned a different color. Normal?

My choclab female kept biting and scratching just above his tail, without rash or visible status. I suspect that self-stimulation, but in any case, the treated as a skin condition (coal tar bath, lanolin ointment, etc. ..). Stubborn Mutt rolled around on her back until she rubs all the drug – and ergo all fu – all the way down to the skin. I started thinking that the skin was not back, but I realized his hair is all over, white only instead of the brown color had orignially. What could have caused this? Could it be right in their latest batch of brown skin and all of this comes in white, From this point on the d / t age and rubbing naked just to make it happen faster there? Indeed, I am puzzled. : -?

This is a type of scar. hair follicles are damaged, either by the medicine, or what was wrong to begin with. More likely is that some may not be brown again.

Dog Training & Canine Health : How to Get Rid of a Rash on a Dog