Bingo! There is your answer...
Nothing a little holy water would not cure. You were both baptized when babies where you not?
Any 'Ouija' boards in the house? I'm also Catholic, but more of the rebellious type. I have issues with many things in the Catholic church, but my faith and relationship with God is solid.
Does it look like this:
"They have described them in medical term as 'dermatographic urticaria'. It is a type of skin disorder which persists among 4 to 5 percent of population in the world."
"Although harmless, the red raised rash mostly appears from rubbing, scratching and pressure on the skin. Usually the wheals are linear. The episodes may appear intermittently, or may develop daily."
"...and please, be assured, there's nothing paranormal about it. A lot of people seem to have them, and as disconcerting as they appear, it's just something about the skin. As they appear without a direct cause, people jump to conclusions. A skin problem is way more probable than anything else, so don't stress yourself."
Link:
https://www.quora.com/Why-do-I-wake-up-with-mysterious-scratches-in-my-body
If you are worried, you can always get a small 'crucifix' or image of the 'virgin Mary'. She has always kept me safe in times of trouble. Yeah, made it through my time in the military in one piece. Good luck...