i had a knee injury that was severe bruising in the tissue, and i had water around it, the doctor also believed that the knee cap was push up, but he didnt do anything about it.. 3 weeks later i went to physical therapy to bend my knee, and the second time i went, when i was force pulling my knee up it started turning VERY RED AND PURPLE and there was so much pain, and it was like getting stuck that i couldnt get it down, the theripist didnt notice because they didnt watch cuz they had other patients. it didnt feel right. is it normal to have turned those colors?

PLEASE HELP!!