Is it a black flocculent thing? First of all, you have to confirm the fabric of the clothes you buy and see if the label on the waist side of the clothes is pure cotton. Generally, tight clothes will add a small amount of spandex on the basis of cotton. If it is this kind of fabric, it will definitely fade. If not, it may be artificial fiber fabrics such as milk silk and ice silk. At this time, you should open the inside of your clothes to see if there is fiber drawing at the seam, which may or may not be fiber shedding. Mainly depends on the fabric material to judge what is going on.

As for the harm to the body, generally not. The human immune system is very powerful. If it is really possible to cause harm, the most direct manifestation is that your body will itch and allergic skin rash will appear. If not, don't worry.