Could this be PAM or is it conjunctiva nevus? (Photos)

One year ago I developed this little freckle in my eye, I went to the gp and they said to not worry about it. I lost my father from cancer and now I'm worried this could be cancerous. I saw my ophthalmologist and he said keep observing it and come back if it changes. I have noticed it has changed in colour but not 100% sure, could this be PAM or is conjunctiva nevus? (P.S. it has been on my eye for a year now, I have not noticed any change in size, however, it does change in colour sometimes)