There are mainly the following conditions in the inner thighs of men: First, if androgen secretion is more vigorous, it can induce this condition. Second, if you have eczema and ringworm for a long time, you can also have legacy pigmentation spots after inflammation, while eczema is an allergic problem, and long-term allergy and humid environment are related. Therefore, it is recommended to wear loose and breathable pants for treatment, and topical application of Denide, Fluticasone Propionate, and Hydrocortisone Butyrate can be applied for treatment. If you have tinea corporis or ringworm, it is usually caused by foot fungus or gray nails that scratch and cause blackening of the inner thighs, because the skin on the inner thighs is relatively thin and tender and is prone to secondary fungal infections, and there will be inflammatory hyperpigmentation after the secondary fungal infections have improved.