Sclerotherapy for veins in the skin in the back, chest, breasts
Sclerotherapy can be done for skin varicosities and it is used on the breasts, back, chest and so on. I agree with the other doctor that you are describing something completely different - maybe 'prolotherapy' or something else and this is not done in our discipline (Venous and Lymphatic Medicine).
Sclerotherapy is the injection of a solution into a vein to dissolve the vein. What your are describing sounds like epidural injections which are injections into the space above the spinal cord to relieve pain. See a pain management doctor.