HELP! What's wrong with his penis!?!

Ceren
Hi ladies of the world! So, Ive been married to a great man for a year now and for the first 6 months of out relationship everything was amazing. I  had not had any other sexual partners prior to my husband. For the past couple of months or so our sex lifehasnt been the same. 
Everytime we have intercourse his penis becomes red swolen and raw. He complains that it burns alot as soon as he enters inside. I cant enjoy sex knowing that he is in pain and because of the pain the sex doesnt last long at all 😭. We use a ton of lube and are both very careful when it comes to hygiene. Sometimes there are even thin long cuts across the shaft of his penis. We dont have rough sex or anything like that either. Has anyone else had this problem with their partner? 😕 What is the explanation for it and what can we do? 🤔We are planning to go see a doctor about it too but I was wondering if anybody could relate.