Swollen back leg!!

[monster]

Good evening everyone. So I was digging up my pacman tonight for her bath and noticed her back leg was pretty swollen. I also noticed she is kinda pink underneath her back legs so now im worried about redleg. I have never really looked underneath her so I don't know if it is normal. I have tried to attach some pictures but not sure if it is going to work. It worked, im editing my post. L.O.L The temperature is 83 on the warm and 79 on the cold during the day and 80 on the warm and 76 on the cold at night. My humidity is always around the 70to80 mark. My tank is a 20 gl tall. I don't use any lights only uth on the side. Oh and it is the left back leg, it is kinda her whole leftside. Sorry the pictures aren't the greatest they are from my phone.