A<unk> , also known as cutaneous<unk> , is any medical<unk>  that affects the integumentary system—the organ system that encloses the body and includes<unk> , nails, and related muscle and glands. The major function of this system is as a barrier against the external environment.<unk> s of the human integumentary system constitute a broad spectrum of diseases, also known as dermatoses, as well as many nonpathologic states (like, in certain circumstances, melanonychia and racquet nails). While only a small number of<unk>  diseases account for most visits to the physician, thousands of<unk> s have been described. Classification of these<unk> s often presents many nosological challenges, since underlying causes and pathogenetics are often not known. Therefore, most current textbooks present a classification based on location (for example,<unk> s of the mucous membrane), morphology (chronic blistering<unk> s), cause<unk> s resulting from physical factors), and so on. Clinically, the diagnosis of any particular<unk>  begins by gathering pertinent information of the presenting<unk>  lesion(s), including: location (arms, head, legs); symptoms (pruritus, pain); duration (acute or chronic); arrangement (solitary, generalized, annular, linear); morphology (macules, papules, vesicles); and color (red). Some diagnoses may also require a<unk>  biopsy which yields histologic information that can be correlated with the clinical presentation and any laboratory data. The introduction of cutaneous ultrasound has allowed the detection of cutaneous tumors, inflammatory processes, and<unk>  diseases.
Skin condition
Body shape
Physical fitness
Pain in animals
Physical strength
Mental state
Pain stimulus
Vision