Sheepshape

Hello, any idea what lumps on my 4 yr. Old ewe might be? Just sheared her a couple days ago. Discovered several lumps in various locations. Some very tiny but one as big as a nickel and half an inch high. All had nasty black greasy gunk in them. I squeezed out all I could and irrigated with peroxide, then sprayed blukote. Someone suggested I ask you.