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Bruising and discomfort after sclerotherapy are natural which normally resolves within a few days. But since you said your veins look worse and are more visible after the procedure could indicate a complication. It's good that you have already spoken with your doctor, but still experiencing discomfort or have any concerns, follow up with them promptly. 

In some cases the veins may fade on their own over time, but if the issue is related to the sclerotherapy procedure, additional treatment can be needed. Its best to follow up with your doctor to discuss your options and determine the best treatment.

Skin redness and irritation have been linked to the use of Clindamycin Phosphate Gel 3%. You may be having an allergic reaction to the gel. It is advised that you should discontinue the use of gel and seek consultation with a dermatologist for appropriate assessment and treatment.