Definition of Topical

1. Atrial Fibrillation Slideshow Pictures
2. Bad Bugs and Their Bites Slideshow
3. Understanding Ulcerative Colitis Slideshow

Topical: Pertaining to a particular surface area. For example, a topical agent is applied to a certain area of the skin and is intended to affect only the area to which it is applied. Whether its effects are indeed limited to that area depends on whether the agent stays where it is put or is absorbed into the bloodstream. Cortisone creams are topical 'medications.