I Am Freaking Out.... About A Month Or So Ago

I am freaking out.... about a month or so ago I had a blood blister on a stretch marks on my stomach but after I popped it I still would pick at the scab out of habit. I'm freaking out now cause I still have a little dark place where it was idk if I scarred it because I wouldn't let it heal properly but I'm freaked out it may be skin cancer.