Skin allergy perhaps?

     This is twice now in a 3 month time frame.  The first time her cheeks were turning red, almost if a child was running a high fever... Even though she wasn't, at first I DID think so.  She definitely used this to her advantage.  Stay home from school, brother needs to bring me popsicles etc.  There was no fever, no symptoms at all.  The redness turned into spots that looked burned.  It was horrible, I felt so bad.  I took her to the doctor, they said it was probably an allergic reaction to something and here is an antibiotic ointment.  It took a good week and it finally started to clear up.  That was it, gone!  Until last week.... Here cheeks turning red was the first sign.  They immediately started looking like she was seriously burned.  I'm not talking about a sunburn either.  Took her back to the doctor, they gave her Bactroban ointment to put on the really bad spots and Aquafor for the rest.  It was getting worse, but we hung in there and continued treatment and today it is healing nicely, but the one spot almost looks like it could scar.  The doctor has now explained if it was an allergic reaction to something it would come and then go away more quickly, not linger for 1-2 weeks.  Ok then, what the hell is it?  Just today I went and bought "dye and perfume free" laundry soap.  I had her quit using ALL soaps and lotions.  Now mind you, before this she was using Cetaphil and Eucirin soaps, which I thought were mild.  Has anyone experienced this?  She is 11 yrs old, I'm trying to teach her good face washing, but I'm not sure what to use?