Should my legs look like this 11 weeks after Sclerotherapy? (photo)

This is either coagulum trapped in vessels and/or some possible hyperpigmentation.  Luckily these are transient findings and should resolve.  If coagulum, I usually express this content approximately two weeks after the procedure.  I laser can be used to treat the hyperpigmentation, although this can resolve with time alon  

Sclerotherapy is considered the gold standard in the treatment of spider and reticular veins but there are common side effects to consider.  Your pictures seem to show evidence of trapped blood and some hyperpigmentation (skin discoloration) which can occur with various sclerosant solutions.  Without seeing your legs in person it is difficult to tell whether draining additional trapped blood or simply waiting is the best approach.  Having said that, discoloration generally resolves on its own but it can take months or even a year in some cases.  Avoid sun exposure to prevent the discoloration from becoming permanent and see your treating physician to determine if you need additional treatment.

Sclerotherapy remains the treatment of choice for small lower extremity spider veins and "broken blood vessels."  In a recent October 2016 article on the subject in Practical Dermatology, regarding sclerotherapy, the author wrote  "For lower extremity telangiectasias and reticular veins, percutaneous lasers and non-coherent light, heavily financed and promoted by commercial interests, are often the driving force behind lectures at prestigious meetings and lengthy peer-reviewed articles. These modalities are less effective, more costly, and a great deal more painful than sclerotherapy, which is still the gold standard for treatment of small lower extremity veins."  Nevertheless, this does not mean that it is without its potential complications. Detergent sclerosants, such as polidocanol, and osmotic agents, such as hypertonic saline have been associated with post-treatment pigmentary problems--the latter with marked post-treatment hemosiderin (blood product) staining, which can be quite cosmetically unacceptable, and the former with postsclerotherapy hyperpigmentation in upwards of one-third of patients. Although not approved in the U.S., the least problematic vis-a-vis post treatment pigmentation is the chemical irritant sclerosant chromated glycerin, which has lately garnered increased interest. For spider and reticular veins, it appears to more effective than polidocanol, with fewer adverse reactions. Happily most hyperpigmentation will resolve over time, although this may take many months. Without clearer photos and more history, the best advice would be to return to your treating physician.to discuss measures for speeding the process of fading, if possible. Best of luck.