Honestly, I've had similar experiences. It still happens to this day. It gets sore, but not from chaffing, I thought it was due to it actually growing. I've researched when cis-males go into puberty, even they experience some soreness & pain due to growth. Even so, does sound like yours is a bit more extreme, irritation, itching and all that is not a normal occurence! Really, better to be safe than sorry and definitely mention it to your endo, perhaps. Sorry to hear you are having a bad experience!
Er... what I have been doing is using a paper towel that is rolled up, oiled with some of the massage oil from Indigo Wild mixed with the zum rub, lol, and/or some personal lubricant to help keep it kinda moisturized (all that stuff is natural, no chemicals). It's a process, but it has been helping me at least! Keeps it from chaffing and kinda doubles with the "packing" process. (and it smells great? lol)

Have noticed extreme dryness after a few months, along with the "cycle" stopping, everything else seems to stop, too.