Hello, You are suffering from painful black patches on the legs. The patches have increased in number. Your symptoms of developing brown / black discoloration around the ankles and lower leg are indicative of long standing venous insufficiency that may complicate to venous stasis. Get treated for venous insufficiency. Avoid standing in the same position for a long time. Patches of discolored skin have many possible causes, like skin cancer, birthmarks, pigmentation disorders, rashes and infections. Brown or black spots can be due to hyperpigmentation commonly caused due to higher than normal levels of melanin. Get examined by a dermatologist , get treated. In the meantime, you can apply Hydroquinone or retinol cream on the affected area. You may be recommended laser or other treatment if required. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician