Sweat hairs that are uprooted will usually grow back if the external force does not cause permanent damage to the hair follicle, but due to the different growth periods of the hair follicle, the time required for re-growth is also different. Sweat hair grows from the inside of the hair follicle, and the follicle provides nutrients to support the growth of sweat hair. If no permanent damage is done to the hair follicle during the plucking process, the hair will grow back even if it is uprooted. However, hair growth is cyclical and is divided into anagen, anagen and telogen phases. If the plucked hairs are in the anagen phase, you can see the hairs grow again in about 1 week; if they are in the resting phase, it will take 3-4 months before the hairs grow again. If you want to know the growth of sweat hair after uprooting, it is recommended to go to a regular hospital to consult the relevant matters. It should be noted that if you frequently pull up the sweat hair, it may cause folliculitis and may lead to permanent destruction of the hair follicle, so it is generally not recommended to pull up the sweat hair by the roots.