test injection

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Updated on Jan 26, 2019
My son had frequent cold and cough so we went to our paediatrician he has investigated him through blood test and x-ray it shown that he have so much mucus in the chest... and a test injection also given on the top layer of his skin... it is slightly swelled up... is it a symptom of primary complex?? but the swelling is little small in size... if it is a primary complex is it cause more problems in him?? am really worried pls help me with the right solutions...