14 year old female patient admitted with complaint of fever since 5 days and oral ulcers since 3 days. Given antimalarial therapy initially when patient turned out to be malaria ag +ve. Currently it's the 10th day since admission antibiotic amoxycillin + potasium clavunate is given 1.2 gm plus oral medications steroid and benzocaine creams with multivitamin and other conservative drugs . There is no fever currently bit odynophagia, pharyngitis and mouth ulcer still persist. Probable diagnosis and treatment?