What is the crusty skin condition on my cat?

[Elizabeth]

Yoshi is one year old, black and white shorthair cat. He lives indoors, and doesn't come in contact with any other cats, except maybe through closed windows. I also have a five year old shih tzu, and almost two year old hooded rat.

The actual problem is a bump on his back, under the fur. It is grayish-brown, and crusty. Some of it picked off leads to blood underneith. It is about mainly round, though extends a bit into a line. He doesn't seem to be itching or licking it.

I don't know if this is relavent, though there's also a tiny bit of dried blood (I'm assuming) in the corner of his eye. It's much like the usual bits of dried goop that forms there in him and other cats, just with red pigment.

What is this, or where is a good website which I can find an answer on? I'm fifteen, though my parents are going to take Yosh to the vet soon. Although I'd like to have a general idea of what this might be. Thanks for any answers.
It's not around an injection site, he hasn't recieved one recently.

[zamarel]

My cat had this. I bought some Derma Dream salve made by Halo at the pet store and it cleared it up.

[Terri B]

Is the lump near an injection site? Some injections can cause reactions. Don't pick at the crusty part, and get him to a vet as soon as possible. In a young cat, allergies are a possibility. As he doesn't go out, this is unlikely to be a parasite.

You can try www.fabcats.org, which has good advice about cat health. But really, your vet is the person to ask

Hope Yoshi is okay soon!