If there's a lump there already from testosterone based steroids, I'd go with nolva @ 60mg's a day, possibly along with letrozole if you have it, until the lump fades and either continue with nolva @ 20mg's a day or pick up the letrozole protocol.
If the lump is from a progesterone based steroid, I'd drop the steroid altogether and start taking dostinex .5mg E4D until the lump is gone (or shortly thereafter), then *maybe* consider starting the steroid back up. Remember to continue taking the dostinex if you pick back up the steroid again.
Once again, this is from memory of what I'd read in the past, and what "I'd" do.