My 90 year old mother, who is very healthy but has been in the sun all of her life, has a growth of skin on her shin which is very large now. I came to stay with her for awhile and noticed it then (3 weeks ago) and thought she had run into something, however it has not changed appearance expcept perhaps worse. It is the size of a silver dollar and has a volcanic look with a black center irregular angry red edges and grey dead skin rising about 1/4 high. She is living in a remote area but we are planning on seeing a doctor when we go into town in a few weeks. Is this something we should go into town sooner for? Can you tell me anything based on my not too good description? Thank you