hey my question is does it matter where i inject it i know to switch body parts every time but if i keep it just on my cheecks and thighs (what im doing right now)would that be ok? or do i NEED to switch to my shoulders and upper body to see an increased result? (my friend doesnt feel confident enough to do it to my shoulders).....and what if i dont massage it in for a good while does that effect my results?.......THANK You