The accurate judgment of the location of wool boil is as follows: Generally speaking, the skin on the front and back of the chest and back is tight and stiff, or the red dotted papules on the neck and the anterior region of the heart are not bled by picking with a needle, and the flocculent material like wool appears, which can be judged at this time. Wool boil is a small black spot in the sweat pore, first use the nose of the needle to press into a concave, then use the tip of the needle to gently provoke, if the black spot is hard and resistant to the feeling of the “wool boil”, use the needle to pick through the wool fluffy fibers, without bleeding. Woolly boils appear on the chest or back, with red, inconspicuous bumps on the surface, unevenly distributed, pressed with a needle, sinking down to repair generally slow. It is usually accompanied by headache, fever or chills. It is recommended that patients should seek timely medical attention if they are unwell, and should not blindly treat the condition on their own to avoid delay.