What Causes Yellow Vaginal Discharge?

Hi i feel like i have had thrush for a week so went to the pbarmacy abd got a tablet and a cream and it seems to have gone altbough im left with what feels like a prick at the vagina opening which is not painful when touched. I also not sure if its in my head as a week and half a go i wad giving someone a bed wash as im a carer and i found what looked like herpes (now confirmed) i cleaned her up and there was heaps of yellow discharge on the towel but the towel drapped past arm and i was paranoid i was going to catch it. Is it likely for me to catch it tbrough that and what could my prick be