Bleeding after Masturbating

Rachel
Ok, so me and my bf are long distance, and have been for a year now. And more recently we have started having Skype sex sessions. And they are always really enjoyable for us both. But last month after one of these I noticed that when I finished there was some dry looking blood on my hand. I was freaked out at first, but then my period started the next day so I figured it was just because of that. But after my period ended, and I masturbated again, I noticed the blood and was spotting for about a week, and I've never spotted before :/ and I've noticed blood on my hand every time since and I have no clue why. Is this something I need to be concerned about and go to a doc? Or just a weird occurrence to not stress about?