Hi there,
Sounds like you may have some bruising going in. Do you use an auto injector? I don't think you need to stop, you just may have to adjust spots or injection technique. Hips and stomach are my best spots, and yes, I do have some soreness too but only once in awhile in my thigh. I only feel it if I push on the spot. So, it doesn't bother me because it's spots that don't get pushed too often.
Question for you - are you injecting high in your thigh? If so, the better spot would be lower, not as low as your knee, but higher than the knee and lower than high thigh.
Hip is less hip and more love handle. So, if you place the palm of your hand on your butt cheek then come straight up and then over to the left or the right. And, that hunk of skin there takes injections well. The charts they provide are definitely off in my opinion.
I inject straight up and find is way less abrasive than the auto-injector.
Bumping up a DMD user list for you so you can do a shout out to some others if you like.
http://www.medhelp.org/posts/Multiple-Sclerosis/DMD-Users-Past--Present---Copaxone--Rebif--Avonex--Betaseron--Tysabri--other/show/1193746
Hope to help - please ask anything!
-Shell