Therefore, many different types of skin disease may resemble one another and diagnostic testing, sometimes extensive, may be necessary to determine the cause of an individual case of skin disease. Skin cytology (an examination of the cells collected from the surface of the skin) help detect bacteria and yeast organisms in the skin as well as various other types of cells. For instance, flea allergy dermatitis (an allergy to fleas which affects the skin) needs to be treated with adequate flea control in addition to controlling any secondary bacterial or yeast infections present on the skin. As with other causes of skin disease, adequate treatment of the endocrine disease will be necessary in order to correct the resulting skin disease.

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