Suggest Treatment For Soreness And Redness On Penis Head

Hello I have a question about some redness and small cut near my head of of penis and after some web searching it might be Balanitis . 1st kind of noticed when me and my girlfriend has unprotected sex and she was pretty dry towards the end after which i noticed some soreness and redness. it went away but maybe a week later it happened again but i thought it was due to oral sex with teeth. I notice the redness after oral sex another week after that. ive used 1st aid ointment but doesn t help much.