I thought I had a mole in my inner right thigh, it was a bit crusty on top it didn't changed color or size as I'm aware of . I thought I had a mole in my inner right thigh, it was a bit crusty on top it didn't changed color or size as I'm aware of But today when I scratched there a little bit ,the crust started to come out ,I scratched more the crust on top came out ( full black) , and a hole (crater) is visible (without blood) full black in color . It's like black crust was covering black hole on skin ,what could it be ? I'm scared I have reading about Melanoma and I'm scared.