Black lumps on the knee may be caused by hyperpigmentation, trauma, pigmented moles and so on.
1. Hyperpigmentation: If the part of the knee with black lumps had a wound before the occurrence, or experienced a long time of sun exposure, it should be considered to be caused by hyperpigmentation, such people should do a good job in the daily protection, generally no special treatment.
2. Trauma: If there is a trauma before the occurrence of black lumps on the knee, it should be considered that the loss of subcutaneous tissue caused by trauma is caused by local bruising.
3. pigmented nevus: benign proliferation of melanocytes in the knee can form pigmented nevus resulting in a black lump on the knee with regular edges and clear borders, which can be surgically removed under the guidance of a doctor.
If you have a black lump on your knee, you should consult a doctor in time.