I'm 4 weeks post op. One butt implant harder than the other?

They only put a drain in one of the cheeks(the one that feels ok) and took it out after a week. 2 ws after surgery I started feeling one implant just a bit harder. They look pretty much the same. But I feel the difference when I touch it. It's not painful when I walk or sit. I haven't gotten any fever and my scar is perfect. There's no redness around the area. I got some massages and when they put some ice there it felt like burning and then the feeling was gone.