Need help with cat skin problem

Hi all,

This is my first time posting to this news group.

Our family cat of 13 years (100% indoor cat). has developed an unusual skin
condition.

Small bumps occur on her inner and outer ear and around her eyes. They
eventually rupture and form a small red crust or spot of blood.

These eruptions do not occur anywhere else on her body and they are not
itchy.

Presently she is on antibiotics (5days so far) and no change.

I can post a link to photos if needed.

All help/input/suggestions are welcome!

Thanks Again
Philip Janet & Bronte (cat)