A little worried

Around the outside of my vagina started to turn a tad bit red. At first I didn’t really worry because I was on my period. But then one of the, I guess you could say lips began to swell & itch. It’s only on the out side though. I don’t know what it could possibly be. I don’t have sex and I’m clean. Someone suggested it could be a change in diet or products, but I’ve used the same pads, brand of underwear, and wipes & soap. HELP 😭.

Edit: I don’t use soap directly on my vagina. Sorry for the misunderstanding.