A radio frequency sclerotherapy system includes a needle assembly with a thin (26 to 32 gauge) solid conductive needle, about 1.25 inches long. A multilayer coating is applied over a proximal portion of the needle leaving an uncoated distal tip, about 0.10 inches long, exposed. The multilayer coating is an electric and thermal insulator. An electrical plug electrically coupled to the proximal end of the wire. The multilayer coating provides a palpable transition. A generator supplies voltages in the range of 300V to −100V, at frequencies of 1 MHz to 50 MHz, with voltage spikes having a time from rise to fall of up to 100 nS and a low voltage between voltage spikes for about twice the duration of the time from rise to fall of the voltage spikes.