Veins increased and worse on thighs and back of calves after sclerotherapy. (Photos)

Hi and Thank you for your question!
Consider a consultation with a vein specialist- board certified in venous and lymphatic medicine- to evaluate you. Ultrasound imaging of your lower extremities might be necessary to determine underlying vein process that might be causing the cosmetic sclerotherapy treatments you have had done to not give you an improved look. Based on clinical evaluation and imaging results, your physician is able to recommend best treatment plan for your specific case. It might be necessary to medically treat first the underlying venous reflux in order for the cosmetic treatment to improve appearance afterwards. Venous reflux can develop when the valves that keep venous blood flowing out of the legs and back to the heart no longer function, causing to pool in the legs and leading to signs and symptoms such as dilated veins that you can see closely to the skin, among others. Many factors contribute to this process. Vein specialist will discuss further with you about signs and symptoms, contributing factors, options to treatment, and preventive methods. 
All the best, 

I would highly recommend to see a vein specialist and get a complete ultrasound exam to determine large vein reflux. When done correctly, sclerotherapy should only improve your vein appearance.