@the Apologies, in hindsight on a smaller view it's obvious where the lumps are - my brain couldn't interpret the shadow of the body on the right as anything but an interrupted taped wire of some kind. Those are definitely some odd shapes and the squareness would lead me to think it's projecting the fur straight off the body with a sharp protrusion in the skin. A really bad botfly situation might look a bit like that but it's hard to tell.