By seeing your complains there could be two chances of this skin reaction first it may be due to drugs which they have administered which usually will reduce with discontinuation of drugs and administration of steroids
and antihistaminic drugs, secondly it may be due to staphylococcal bacterial infection, which will take time to resolve repeated throat swab culture is ideal with 3 blood culture
to confirm it. i strongly suspect scarlet fever
, which should subside with properly selected antibiotic and supportive treatement.