perhaps my advice is too simple

my crayola had a hot spot from a bit a few months ago and got his itchy bitten area covered with a cream to keep it cool and had him taking two pills a day (it really helps! including not to have him feel it too itchy to itch!) for 14 days. oh ...or 7 days, not sure. also, 1x for two-three days, spray with hotspot liquid, great job bottle!

try pills? you'll be amazed how it works if they can work for star too! hopefully this nusiance issue goes away very soon, my dear.