Perineum to thin after having baby??

Basically after i had my daughter it took awhile before me and my husband could have sex. I felt like i had scar tissue from tearing that made things painful. Finally after like 4-5 months it went awhile and we were fine. Fast toward about 3-5 months later now for some time it doesnt matter how much lube is used or how long or short it is or even position or angle, my Perineum always gets irritated and splits slightly at the top and gets swollen. Its just thinned out overtime, we're trying again but cant have sex so often in a row during my fertile cycle because of this. Anyone gonw through this?