What is this?I am scared

Na

Hey.So last night i was studying when i saw something red on my hand and i touched it and it felt like there was something in my arm.It didn’t hurt.Now i woke up and there is no red but this swelling is still there.My mother said that she thinks that is something dermatological but i am scared it might be cancer.What do you think?Ofc i will go to the doctor but i am just super scared.