Aduh, heat rash ke fungal infection ni, memang annoying! Kena make sure area tu betul-betul kering after shower, jangan langsung pakai baju, dan try guna talc powder atau anti-fungal cream yang ringan mcm Loratadine or hydrocortisone cream dari pharmacy, but honestly kak, kalau dah berbulan-bulan garu-garu camni, better check dengan doctor atau dermatologist sebab mungkin perlu cream yang specific untuk skin condition dia, bukan just moisture cream. Few of my mum friends pun had similar issue, turned out kena proper medication from clinic. Hope it gets better soon!