Ob-Gyn questions? Ask a gynecologist online.
Hello, I'm Dr M, obgyn. The blisters could be related to the trauma during sex or could be a form of herpes virus. Herpes is more alarming than it should be. It's the same virus that cause oral "cold sores". The lesions are activated by stress and prolonged with worry. I've had many patients control even cold sores by not fretting when the area has some sensitivity occurring. The areas heal up rapidly including in the pelvic area. Try ignoring it for now as an abrasion will heal on its own and herpes if controlled by the immune system.
Dr M again. If it's unlikely to be herpetic, then if you have Desitin or Vaseline, then apply it to the lesion to cover it from the urine. It should heal well in 24 to 30 hours. I can't imagine needing any suturing. There was no obvious bleeding right after sex I imagine.
A blister per se wouldn't burn unless it popped and the sensitive base is exposed. It will be self-limiting and heal up. At this point don't worry about it.
That would raise the herpes consideration. I have to ask but was there any oral-genital contact? I ask this as the herpes type I virus that causes "cold sores" can cause genital lesions that get pretty uncomfortable. No matter using a lubricant will help and not stressing over it helps a lot.
It's a little confusing although with diabetes there is the tendency for yeast vaginitis which may aggravate an abrasion. Use a lubricant for now to help the symptoms and if this drags on you'd need to be seen to find clarity.