object, time loss, body marks,

on this night 5 others (all adults but me)and myself where on the front porch visiting, suddenly about 100 yds from us an object come in over the tree tops and stopped.  I remember it being cigar shaped, about 150 to 200 feet long and about 50 ft in diameter, as we all turned to look, i know that everyone but me looked frozen in place, i couldn't move but was completely aware of the scene. i have no idea of how much time past, but just like it happened at first, everyone looked frozen stiff, no there was any ice just unmoving,the craft disappeared and the others went back to what they where doing,i asked them what that thing was and they all had no idea what i was talking about even laughed at me.  
Some point days later i noticed a circular purplish spot on my left inside ankle,approx. 3/8 diameter, being than young i gave it no concern.  I have received 4 more of these in different locations on my body over the yrs, several doctors have seen them and do not have any idea what made them.
Witness indicates that the date of the sighting is approximate.  PD