Brown spots on the inner side of thigh root may be caused by coffee spots, hyperpigmentation and seborrheic keratosis, which need to be treated by physical therapy, medication and surgery according to the causes. 1. Coffee spots: brown spots on the inner thighs may be caused by coffee spots, which can be left untreated if they do not affect the appearance. If the coffee spot affects the appearance, it needs to be treated by laser, intense pulse light and other physical treatments. 2. Hyperpigmentation: If tinea cruris or eczema occurs on the inner side of thigh root, brown hyperpigmentation may be left behind when tinea cruris or eczema heals. For patients with hyperpigmentation, it can be removed by laser. In addition, patients can also use hydroquinone cream under the guidance of the doctor and other drugs to lighten hyperpigmentation. 3. Seborrheic keratosis: If patients have seborrheic keratosis on the inner side of thigh root, it is also manifested as brown spots. Patients can take cryotherapy, laser therapy and other physical therapy. In addition, patients can also take chipping, electric drying method, scraping and other ways of treatment. It is recommended that patients with brown spots on the inner thigh root need to consult a doctor in time to check the cause of the disease, and the doctor will choose the appropriate measures to treat according to the cause of the disease.