I have had a lump, flesh colored- no pain, on my outer thigh for 3 months, the last two weeks the lump is gone, but now it is a nasty, itchy, red , circular non painful- unless bumped, liesion on my outer thigh. It is nasty and appears dry on the surface and very dark in the middle With red around. ( NO BITES ARE THERE) I am terrirfied this is aggressive skin cancer! It is a large nickel sized sore.