Suggest Medication To Cure Vaginal Itching

hi! i have a problem with my vagina, i slept with my boyfriend on thursday of which i did not sleep with him for the last 6months, now my vagina started itching like 2hrs ago and am now okey, might this be an infection or? and the other thing is that i have been having very dry skin and sometimes flaky black things on my body, might this be the change of weather or showergell?