Abstract: A laser-applied treatment apparatus includes a TEA type laser unit and a flexible link, such as a multi-joint arm assembly, for leading a laser beam emitted from the laser unit to a desired location, such as a part of a person's skin which is affected by dermatophytosis, in any desired orientation. Also provided is a pair of convex and concave lenses in the optical path of the apparatus for narrowing and collimating the laser beam such that it has an energy density suitable for use in treatment, e.g., athlete's foot. In one embodiment, a hand switch is mounted on a hand piece portion of the flexible link, and it controls the operation of the laser unit. Also provided is a foot switch which is operatively associated with the hand switch such that the operation of the first switch is rendered valid as long as the foot switch is kept depressed. Such a double switch structure provides an advantageous safety feature.