I injected myself with sust in the thigh and it is very sore.The second day was the worst.It does seem to be getting better this morning.There is not bruise or any cyst-like spot but it feels like a very deep bruise.I used a 23 gauge 1 " pin.this is the second injection I've done.The first was in my bottucks,but I think change site because the first time I felt the sust run out of the wound and down my leg.