How long does staining usually take to go away after liquid sclerotherapy on the feet?

Thank you for your question in regards to sclerotherapy. Staining occurs when blood remains trapped in the vein after sclerotherapy. It will eventually break down, but can take up to a year. Laser treatments can help break up the dyschromia faster. To be sure what is best for you, see two or more board-certified providers in your area for a complete evaluation to make sure you are a good candidate and that it is safe for you to have treatment. I hope this helps.

I would start with Melarase PM cream on the area with Melapads; followed by q switch laser to help the pigmentation. Best, Dr. KaramanoukianLos Angeles

Staining can occur after sclerotherapy and it does resolve eventually but this frequently can take from up to six to twelve months. Keep in mind it will take a few sessions to see improvement with Sclerotherapy. See an expert. Best, Dr. Emer

For veins that are this sized, an experienced vein specialist would have recommended microphlebectomy, not sclerotherapy.Anyways, you need some topicals to reduce hyperpigmentation. 
You need to use some adjunctive measures after sclerotherapy to reduce post inflammatory hyperpigmentation. it is those that don't follow such instructions immediately following sclerotherapy, starting on day1 (next day) that seem to get retained hyperpigmentation. I recommend 2 creams: Scleroquin plus and Sclerovase and also Scler-X supplement to reduce post inflammatory hyperpigmentation (see link below) as well as compression stockings for at least 2 weeks.
H Karamanoukian MD FCS
certified vein specialist from ABVLM and double board certified surgeon

As the vein shuts down the trapping of blood will potentially lead to staining.  Staining can last up to one year.  If you would like to speed up the discoloration there are superficial laser treatments that will improve appearance in a shorter time frame. 

Staining is usually the result of injecting a vein that is under a lot of pressure.  When the vein is shut down, blood is trapped inside and the pigment from the hemoglobin in the blood can stain the skin.  This will fade but can take months to up to a year.  It is very important to protect this area from the sun, as tanning over it can cause it to remain dark.  If you live in a warm climate use at least an SPF 50 over the area.

I recommend Arnica cream and pills to all my sclerotherapy patients.  They should apply the arnica cream twice a day but that must start immediately after the initial treatment.  When all else fails I have found that bleaching creams can help.  Good luck!

Staining usually is self limiting and should gradually improve over one year.  Your pictures do show a clotted vein with staining around it.  Evacuating the clot will help significantly with the discoloration.  Local care with wet warm compresses will also help the clot. Bleaching creams may or may not help.  Since it is only 10 weeks I would drain the clotted vein and give it more time.

Staining is variable and can go away slowly over the next year even two years.  I reassure my patients that it can take a while for the staining to fade.  Rarely is it more permanent.  Sometimes lasers can help remove the discolorations.  Normally creams do not help.