Is it normal that i like to give myself hickeys, usually subconsciously?

I have noticed recently that for quite some time now I have been sucking on my arm and creating what is known as a hickey. I don't typically do it because it feels good but when I'm either bored or anxious and I don't even notice I'm doing it. It creates these nasty red circles and I don't know what I can do to stop it, every time I have tried I end up once again sucking on my arm subconsciously. :/ Similar to someone who nail bites in a way. Can anyone relate? Is this normal?