a recognition that genres are situated within discourse communities, wherein the beliefs and naming practices of members have relevance an emphasis on communicative purpose and social action an interest in generic structure (and its rationale)
Because of the potential implication of circulation disorders, darkened skin around the ankles that is not immediately explainable by simple environmental factors should be promptly called to the attention of a medical doctor for appropriate diagnosis and treatment.
Black toenails can be caused by a fungal infection, which is common in immuno-compromised patients, or they may indicate underlying melanoma (a malignant tumor consisting of dark-pigmented cells called melanocytes).