Telangiectasia, the varicosities of the lower limbs, are generally broken down by microsclerosis; but micro-sclerosis is often insufficient, even impossible. This is where electrocoagulation is useful. It would be more correct to call it diathermo-coagulation; histological examination does actually show a real bursting of the tissues. To put it into practice an apparatus is needed, producing a high-frequency current; a punctiform electrode is connected at the positive terminus. Using magnifying lenses, the phlebologist penetrates the minute vessel, in depth (1 mm - 1.5 mm) and at points close together. The sessions, which are painless, take place each month, that is, as soon as the scabs have disappeared. Three or four sessions are needed for blue telangiectasia, and at least five or six for red. Exposure to sun or even to open air is forbidden during the year of treatment. The break-down is definitive and need not leave a scar. Moreover, women (it is almost exclusively women who are treated for this) accept these conditions, as they are glad to be rid of unaesthetic hair on thighs, legs, and ankles. We draw attention to the fact that all treatment should be suspended during pregnancy, as most telangiectasia disappear on their own after the birth.