There are many causes of bumps on the roots of the thighs that are itchy, such as femoral moss, which is caused by a fungal infection. It usually grows on the roots of the thighs, and some of them can spread to the scrotum, manifesting as well-defined island spots with clear borders that get better in the middle, which are slowly spreading from the middle to the surrounding area from small to large. Most people in this category have more severe foot odor or gray nails. The infection is caused by the co-washing of underwear and socks. Treatment is relatively simple, with some antifungal drugs can be used, such as Terbinafine Hydrochloride can achieve good results. In addition, eczema can also cause this condition, mostly as a result of improper treatment of ringworm, or it may be related to your own skin sensitivity. The scrotum is an important part of eczema, much more serious than the inner thighs, and can generally be treated with topical hormone-containing medications, as well as with compound cypress solution and herbal remedies. If fungal infections are combined, antifungal medications should also be given. In addition, it can also be seen in pruritus, mainly manifested as dry skin on one or both thighs, with obvious pores, intense itching and scratch marks, consider taking oral loratadine and skin itch granules, etc. It may also be related to poor spleen and stomach function.