Lost 125 lbs at a stand still suggestions?

I log into My Fitness every day and I do measure my food. I exercise daily and change it up sometimes for variety and to change my body doing the same routine. I was dropping weight well and I have been at a stand still for about 3-4 weeks (almost a month) now. It is frustrating. Any suggestions? I eat protein. I do have quite a bit of loose skin which I will have surgery for once I drop another 25 or so lbs. I would like to get in my BMI range and I just can't drop this last bit of weight and I feel I work hard at it. I have not slacked from what I was doing originally. I'm sure I have put on a little bit of muscle due to toning my arms because of the loose skin I wanted to tone my under arms (wings).

Thank you for any help. I'm up for trying new things.