Is it Cancer or a Parasitic Twin? How to tell!

You've got this thing on your skin and you're worried. But before you go to the doctor, read this!

IS the thing itchy?
Okay, that could be cancer or parasitic twin.  But DON'T scratch it either way. 

DOES it have an irregular border?
You always hear that cancer has an irregular border.  Not sure what it means.  But it's good to ask.

ARE there legs and tiny arms sticking out of it?
That might be a parasitic twin.  But who can really say?  Tumors can get creative I bet.

IS it telling you to do terrible things?
Again that could be either, but probably parasitic?  I'm not actually a doctor.

HAVE you been in the sun a lot?
I don't think your parasitic twin would appreciate that. Like, poor guy!

IS it bleeding?
Okay, this thing is starting to sound really gross.  I don't want to look at it anymore!

GOOD LUCK WITH WHATEVER IT TURNS OUT TO BE!!!