I have a big pimple on my knees. it was painfull at the beginning but now it is not. it is big and white in the centre and has red around it. help me?

See a doctor: This infection needs to be professionally evaluated. It could become quite dangerous if ot properly managed, and may require a small incision to drain pus, an antibiotic prescription, or both.

Knee pimple: Thank you for your question. The description of a pimple on the knee that was painful could be a variety of different diagnoses including a possible infection or inflamed joint or cyst. Other associated signs and symptoms are important to assess including the possibility of fever. Evaluation and examination by a medical provider would be essential for accurate diagnosis and treatment.