Why do some doctors say kenalog can be used to help decrease collagen from sculptra and others say no?

Kenalog is great for Sculptra nodules, but your complaint sounds more generalized.  After 7 weeks if you are unhappy and feel overfilled, I think that it would be safe to thread some very dilute kenalog throughout the areas that are bothersome. It may take a few times to reduce the size, but as is often the case it is better to under treat than to over treat  

Sculptra is a wonderful product but the "less is more" philosophy is particularly true of this product.  I don't inject more than one vial at a time in a patient and wait at least a month to observe the results before I inject more product.  How many vials did you have injected? Kenalog probably will not be able to reduce the product.  Within a few months the product may slightly decrease.  I am sorry for your results and I hope it gets resolved quickly for you.  Please find a board certified dermatologist with a great deal of experience with Sculptra in your area for a second opinion.

I'm sorry to hear about your unsatisfactory results
with Sculptra® Aesthetic. At 7 weeks, the results you are seeing now are not
likely to get worse. Kenalog is a steroid that can sometimes be used to break
up the bumps that could be associated with Sculptra. I would not recommend it
for treating "overfill." The best way to determine which course of
action is right for you is through a face-to-face consultation with a doctor
who has experience with Sculptra. It is unusual to see the overfill look with
Sculptra as it tends to fill "zones," but rather with some of the
other fillers that are injected directly into specific areas. You may be
experiencing an imbalanced feeling as other areas on the face no longer look
harmonious with the Sculptra treatment. There may be better options to reduce
the bloated appearance you describe. Good luck.