How to Repair Bulging Varicose Veins After Sclerotherapy?

I would begin treatment of bulging varicose veins before treatment of smaller spider veins.  The choice of treatment depends on your condition and the presence of underlying venous reflux.

Bulging varicose veins are on the skin surface, but the deeper vein feeding the varicosities is usually much deeper and cannot be seen with the naked eye.  A duplex ultrasound will identify the deeper branch, typically the greater or lesser saphenous vein, and show "reflux"-- where the veins allow blood to flow backwards instead of forward, causing blood to flow down into the legs, causing swelling, aching, and more varicose and spider veins.

If you had sclerotherapy for reticular veins, it is quite possible that you have venous reflux which should be diagnosed appropriately, and hopefully the root cause treated with endovenous ablation (EVLT) of your saphenous veins and phlebectomies--the actually removal of the varicose veins.  This will lead to long term treatment and much improved symptoms and appearance to your legs!

I read your post and I have never seen that happen and have never seen it presented as a side effect or complication following sclerotherapy ! A literature search on PubMed (on January 22, 2015), which is a database of 23 MILLION scientific publications, shows '0 results' when a search was made for 'sclerotherapy and cellulite'. It is a pure and unfortunate coincidence that you have developed cellulite in areas where you have had sclerotherapy.More importantly, you should seek a certified vein specialist to have your lower extremities checked for venous insufficiency.