I was recently in Puerto Rico and got really bad rash on my buttocks. I was sitting at night on the beach without a towel and after 7 days I start getting these itchy red bumps. My coworker that is from Puerto Rico told me that I most likely got bite by sand fleas
I was at the Doctors office few days ago and got Hydrocortisone 2.5% and Mupirocin Ointment USP 2% but it’s not really helping pharmacy also ordered for me ivermectin pills that I will get today.. he gave me these because he thought it’s Cutaneous larva migrans but he wasn’t sure so maybe my coworker that is from there is more right..

Can please help me? What should I do to make them go away?