Does anyone know what could be wrong ?

today i have noticed one of my vagina flaps is swollen it is sore and can be itchy if irritated. i havent used any new products and use femwash to clean it so dont think its an allergic reaction. i have also just finnished my period using tampons and pads but used my usual brand. i have been itching jt a lot and not sure if its caused it or contributed to something already wrong does anyone know what it is and if i should book an appointment with a doctor?

image