Redness and tight skin down there?

So I’ve noticed that I have what looks like chafing down between my thighs, specifically where the strip of skin between the anus and vagina and around that where my cheeks meet. I’m like 90% sure it’s chafing but it doesn’t respond to any treatments I have tried, such as washing and drying throughly, petroleum jelly, antibiotic ointment once it turned a nasty red, and now monistat anti chafing gel. It will however go away after a long while of me not shaving, which just furthers my suspicions. Also, if I skip showering for one day then whenever I wipe after using the bathroom I’ll notice very small white clumps. I think it’s skin, because it reminds me of the way dead skin looks after using a Seacret Minerals peeling gel except it’s very white rather than a dull whitish grey color.

Also, note. I have not changed what I’ve been using detergent wise or personally care wise. I did buy new black cotton underwear because I thought it’d help.

What do y’all think it is? What should I do?