The itchy sides of the thighs may be caused by ringworm, eczema, contact dermatitis and other reasons. 1. Ringworm: local moist and sweaty secondary fungal infection caused by the crotch, thighs, vulva and other parts of the manifestation of pimples, edge of the raised ring-shaped erythema and other symptoms, may be accompanied by a sense of itchiness, the more you scratch the more itchy situation. 2. Eczema: Eczema is induced by environmental factors, mental stress, and contact with allergens, which may lead to itching on both sides of the thighs and the more you scratch, the more itchy it is. 3. Contact dermatitis: local skin contact with allergic substances, irritants lead to contact dermatitis, causing local skin acute or chronic inflammatory reaction, leading to the appearance of itching on both sides of the thighs, the more you scratch the more itchy situation. Itchy thighs should avoid scratching the affected area, timely consultation, under the guidance of the doctor to clarify the diagnosis, targeted treatment to alleviate the itching situation.