The causes of itchy skin on the outer thighs include eczema, ringworm, contact dermatitis, etc. The treatment includes medication and so on. 1. Eczema: If it is eczema, it can be treated with topical glucocorticoid ointment such as halometasone and dieldrin cream at this time. 2.. Ringworm: for itchy skin caused by fungal infection, at this time you can give antifungal drugs such as fluconazole capsules or terbinafine ointment and other antifungal treatment. 3… Contact dermatitis: for patients with contact dermatitis, then antihistamines such as cetirizine and loratadine can be given. There are more reasons for the itchy skin on the outer thighs, please go to the hospital for examination and symptomatic treatment in time to avoid delaying the condition.