Reddit reviews Terbinafine Hydrochloride AntiFungal Cream 1% (1 oz.)

I like these clippers for hams

And the description sounds like a possible fungal infection, so you might try terbinafine (Lamisil) Confirm with a vet if possible, but I know that not everyone has the opportunity.

I presume this condition itches. It appears most consistent with [Tinea Corporis] (http://www.skinsight.com/child/tineaCorporisRingwormofBody.htm) aka Ring worm. It is called ring worm because usually there are characteristic rings, though sometimes they are hard to appreciate unless you are looking for them. It is not serious and can be treated with OTC medications like Terbinafine also available at local drug stores.
You should apply this for twice daily at least 10 days after the symptoms and rash seem to resolve. If this doesn't address the problem, please make an appointment to see your medical provider.