When a subordinate clause is used as an adjective or an adverb, it will usually be part of a complex sentence (i.e., a sentence with an independent clause and at least one subordinate clause). The link between a subordinate clause and an independent clause will often be a subordinating conjunction or a relative pronoun.
Dermatoscopy (also known as dermoscopy or epiluminescence microscopy) is the examination of skin lesions with a dermatoscope.
There is no difference at all --- just different names for the same technique. There are also some other terms still used for dermoscopy: surface microscopy, direct skin microscopy, incident light microscopy and skin videomicroscopy, just to name the most common ones.