Suggest Remedy For Itchy Vagina

19yo, 5'11, 216lbs. i went to the beach yesturday and ever since i left i had a slight itching on my vagina. i made sure to wash it really well because there was lots of sea weed in the water, but it is getting more and more itchy which of course turns painful from the irritation. its only on the very tip of the clitoris.