Rashes and lesions in the skin can be symptoms of problems elsewhere in the body . for example, scarlet fever results from a bacterial infection in the throat. the bacteria in the throat release a toxin into the blood that causes a pink - red rash in the skin. the development of a rash can also indicate an allergic reaction to foods or drugs such as penicillin.
the condition of the skin, hair , and nails is affected by nutritional status. in vitamin A deficiency the skin produces excess keratin and assumes a characteristic sandpaper texture, whereas in iron-deficiency anemia the nails lose their normal contour and become flat or concave(spoon-shaped).