Dermatological diagnoses often have more than one name. When examining the skin, a dermatologist assesses distribution , morphology and arrangement of skin lesions: their number, size and colour, which sites are involved, their symmetry, shape and arrangement. The dermatologist will carefully feel individual lesions, noting surface and deep characteristics. Which layer s of the skin are involved? If scaly , does the surface flake off easily?
Many conditions affect the human integumentary system —the organ system covering the entire surface of the body and composed of skin , hair , nails , and related muscle and glands. The epidermis is the most superficial layer of skin, a squamous epithelium with several strata : the stratum corneum , stratum lucidum , stratum granulosum , stratum spinosum , and stratum basale. The epidermis contains four cell types: keratinocytes , melanocytes , Langerhans cells , and Merkel cells.
Whenever you develop a skin rash on some part of your body, your first thoughts may be: Is this serious? Should I see a doctor? The following four rules may help you make that decision. If a rash really bothers you, go see your doctor—period.