Diathermy is an advanced technique employed by Electrologist to reduce and eliminate individual visible surface capillaries (thread veins) and spider veins, on the face and décolletage.  Diathermy is the cauterisation by heat current, of the visible capillaries, which are in the epidermal layers.

There can be many causes of these damaged capillaries including sun exposure, harsh treatment of the skin and injury such as squeezing.  In some cases, fine skin texture and couperose may be an inherited factor.