Pic of Aural Plaques
"type of skin lesion that some horses develop on the inside surface of their ears
. These plaques are usually depigmented, meaning the skin cells of which they are made do not have the same pigment in them as the cells of the surrounding skin, making the lesions appear pale grey or off-white"
Here is some interesting research i found online:
"they’re not itchy, sensitive or painful
. They can occur in any horse, no matter the age, breed or sex."
"The exact cause of aural plaques is still not clear, but using extremely high-powered electron microsocpy, researchers have been able to demonstrate that in some cases there is a papillomavirus infecting the cells within these plaques
. No one has yet been able to isolate the virus to determine what type of papillomavirus it might be. Aural plaques are not known to be transmissible from horse to horse, but since there may be a virus involved, it's prudent to consider the possibility that virus transmission may play a role in their development (although there are likely many other factors involved as well). Unlike regular papillomas (i.e. warts, caused by equine papillomaviurs), aural plaques do not disappear on their own
. It the past, the only way to remove the plaques was to actually cut them away surgically
. In more recent years, successful treatment has been reported using an immune-response modifier cream
such as Imiguimod, which is used in people to treat several different skin conditions, including genital warts."