There is disclosed a method of treating affected external or surface tissue comprising the steps of providing a source of affected external or surface tissue； generating a source of microwave energy； transmitting said microwave energy into said affected external or surface tissues； exposing said affected external and surface tissues to said microwave energy to raise the local temperature to thereby ablate, remove, coagulate or otherwise alter said affected external and surface tissues. There is also disclosed an apparatus for the treatment of affected external and surface tissues comprising a microwave energy source generator, a means to transmit said microwave energy into said affected external or surface tissues, a means to control the exposure of said affected external and surface tissues to said microwave energy to raise the local temperature to thereby ablate, remove, coagulate or otherwise alter said affected external and surface tissues； and optionally a means to control the repetition of steps a) to d) multiple times until the ablation, removal, coagulation or otherwise alteration is complete, the period between each sequence of steps a) to d) being optionally cooled, and the location of said concentrated electric field being varied.
