Aih, tu biasa jadi masa ambil antibiotik berat, probably candida infection (fungal) sebab ubat tu bunuh good bacteria jugak lah, a few of my mum friends kena sama when pregnant or after meds Lepas gatal2 dan putih2 tu, kena tanya doctor pasal antifungal cream or oral medication, jangan tahan2 sebab akan terus spread. Mungkin dia akan suggest Canesten or similar, but definitely check with your doc first sebab ada different types of treatments depending on severity!