Ow, so sorry. Just to clarify, if it's a fungal infection, which can easily happen on steroids, you need an anti-fungal cream, NOT an antibiotic.
I know this the hard way because antibiotics always cause a fungal (yeast) infection for me. They kill off all the good bacteria along with the bad, and then the yeast and fungi grow fast and wild.
Andy got a yeast/thrush infection in his mouth when on steroids and bactrim, and had to rinse with Nystatin. It doesn't help the whole body though. What we realized is that thrush visible in the mouth or sores visible on the skin are only the tip of the iceberg, fungus-wise.
Once you get this under control, it's good practice to pro-actively support your whole gut by taking PRO-biotic supplements and eating pro-biotic foods such as yogurt, sauerkraut, and drinking fermented kombucha tea. This will support a healthier immune system and also make for a happier gut. We all like happy guts.
Best,
sarah
mom of Andy 27 dx gbm/pnet 1/09