Big black spot on my back upper thigh for about a year now in pain, intestinal problem??

You need to get to the doctor right away. Do me a favor and pray. Read Psalm 35 (Plead My Cause) and give all your worries and cares to God. Say this psalm often. It is longwinded, but it is worth your time and will truly help you. Remember this, What shall we then say to these things? If God be for us, who can be against us? - Romans 8:31. The Lord daily loadeth us with benefits, even the God of our salvation. Selah. - Psalm 68:19. I want for you to be alright. Peace and God Bless.