my vagina hurts like burning at the 4th day of my period.

Jina

Am I the only one who start to feel vagina burns and hurt from around the third or fourth day of period? I dont know but this sore pain comes from excessive acid rates or something or some germs or infection? And it looks red and swelling too. I wash mine every day though, even on my period. I need help!

Oh i forgot to mention that i use sanatary napkins on my period.