I have noticed on the top of my foot, skin discoloration, like a generalized age, a spot app 3 x 4 cm on the lateral aspect. It is flat, more brown than my fair skin. I am of Scandinavian descent. At first I thought I might have bruised it, but it hasn t gone away after 6 weeks. Should I be concerned? It doesn t look like a mole but as a 61 year old female that spent a lot of time in the sun as a teen with minimal sun block (#30 was perscription for albinos) I wonder about melanoma. What are your thoughts?