What Causes Redness Along With Itching In Vagina?

Hi I keep gettin a sore ichy red inflamed vagina mostly after iv used sanitary towels as now the manufactorys have started usin a fresh scent perfume in them to keep u smelling fresh I think I may be allergic to the perfume stuff but can u please help me im in agony an hurts when I walk dont know what cream I should use for the pain I keep clean an change sanitary frequently