What is the best scar removal cream for black spots on the legs?

Unfortunately the brown spots on legs from injury, bug bites, infected hair follicles, eczema etc., that have been there for years often allows the pigment granules to drop deeper in the dermal layer below the epidermis making it difficult or impossible for lightening creams to improve them. Some lasers have been effective in a few individuals to make these spots better, but very often, the lasers themselves darken the skin more because of the patient's own tendency to hyperpigment (darker skin developing in areas of inflammation or trauma). Lightening creams will often be used in advance of the laser treatment and I recommend a test spot to be done prior to treating the whole leg to see how the particular's patients skin will respond. The lasers I have used to treat hyperpigmentation have included q-switched ruby laser, Neodynium-yag laser, picosure laser focus mode, Clear & Brilliant Permea and even the V-beam laser (sometimes there is an element of redness in the dark color). 

I see this condition very often in patients with Olive or Black skin. I perform chemical peels in the area and combine the regimen with topical cream treatments. The results are effective. I would use Melarase twice daily for the hyperpigmentation.The development of dark spots on the legs post insect bites is known as PIH, or post inflammatory hyperpigmentation. This results in an overstimulation of pigment granules that often get trapped within the dermis of the skin. In my practice, I use the Melarase creams (Melarase AM and Melarase PM) because they can decrease the rate of production of abnormal melanin and enhance exfoliation of existing melanin. Melarase AM contains four active sunblocks + skin lighteners.  Whereas, Melarase PM contains HQ and natural skin lighteners with an exfoliant.  The process will take some time, but is highly effective. Luminase and Exfolase are excellent for dark scars on larger areas. Best, Dr. Karamanoukian#Realself100 Surgeon