Zefra had a reaction similar when she was spayed.
She ended up getting a antibiotic cream to put on twice per day. You can't even tell now (been a good month). She did pop 2 stitches though, which was the cause of the infection/rash.
K-W German Shepherd Club
Wild Winds Archangel Raphael TT, HIC, DM Clear
G Wild Winds Zephyr of Cognac HIC, DM Clear