Suspicious mole

hello! I’m new and was just hoping for some reassurance really. A few days ago I noticed a mole on my mums chest near her collarbone. I think it has always been there but I don’t know, anyway, I saw a darker part of it (initially I thought it was a bit of cotton stuck to it) but when I asked she said she’d been meaning to make an appointment so she’s could get it removed as she keeps injuring it by getting it caught on clothes and making it bleed from itching it - I’m going to make sure she goes to the go but I was just wondering if the dark colour I saw could just be a bit of blood from her keep knocking it? That’s what she thinks it is but I’m going to make her make an appointment anyway. Thank you