The best time for self-examination is after bathing, this is because any local tension will make the scrotum contract and affect the examination, after bathing the scrotal skin is relaxed and the examination is easier and more accurate. Specific technique: take a standing position. Make the scrotum droop naturally and hold it up with the palm of your hand to observe and appreciate its size and weight. Gently squeeze the testicle with both hands, placing the thumb above the testicle and the index and middle fingers below. Gently turn the testicle with the index finger and thumb to check its size, whether the surface is smooth and whether there are any hard lumps, and note any difference between the left and right testicles. If there is an abnormal pea or pigeon egg sized lump without pain, be alert and seek early specialist examination by a urologist.