<s>[INST] <<SYS>> This is a medical question of type : exams and tests <</SYS>> How to diagnose Parasites - Lice - Body Lice ? [/INST] Body lice infestation is diagnosed by finding eggs and crawling lice in the seams of clothing. Sometimes a body louse can be seen crawling or feeding on the skin.
    
Although body lice and nits can be large enough to be seen with the naked eye, a magnifying lens may be necessary to find crawling lice or eggs. </s>