Hello Wayne ,
I am Dr. Arun and will be helping you today.
Let me at the outset tell you that it may not be anything serious. This may be just the stagnated blood (bruising and small leaking of blood in soft tissue, called as hematoma formation), which changes color with the time and can discolor the skin. The decrease in the pain during activity or walking is due to better venous drainage as the muscle act as pump and push the blood from the area. While rest or sitting cause further stagnated or pooling of blood which increases the pressure in the tissues of the legs, thus increasing the discomfort.
Having said that, getting an evaluation would be advised at ER (as urgent care clinics are closed and waiting till 8 AM of Monday morning is not recommended). You are taking blood thinners which may cause fresh bleeding in the area (termed secondary hemorrhage) or continuous leak in the area. You may require blood work like bleeding time and clotting time and a colored Doppler study (specialized ultrasound) for the evaluation of the veins. The other thing need to be ruled out would be compartment syndrome which is increase in the pressure in fascial compartments of the lower limbs which may jeopardize the venous circulation. Increased walking can be contributory factor for the compartment syndrome. Both of these possibilities have very small chance, but we need to work on highly cautionary side for;
1) your present symptoms,
2) in your age group,
3) with your medications and
4) with the past medical history.
Any increasing swelling, pain, darkening also would point to immediate evaluation.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
Thanks for using Just Answer.
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