Sclerotherapy for dense patch of blue telangiectasias by @veintreatmentcenter You may need more than one session of therapy. Some individuals need additional cosmetic laser therapy. 1. Sclerotherapy is not an instant fix. 2. It can take 2-3 months or more for the veins to disappear. 3. More than one session may be necessary for a treated or injected area. 4. The injected veins will look worse before they get better. 5. Patients with darker skin pigmentation are at higher risk for permanent skin