Because evaluation of the skin is so readily available, a number of diagnostic measures—many of which are noninvasive—can lead to a specific diagnosis. Examples include: KOH examination and fungal culture, Tzanck preparation, scabies preparation, Wood light examination, and patch testing. Skin biopsies using a punch, shave, snip, or excisional methods are relatively free of complications. Cryosurgery (see below), phototherapy (discussed in Chapter 14: Psoriasis), and advanced surgical procedures such as Mohs micrographic surgery (see below) are but a few of the many available therapeutic modalities available for skin disorders.