Betamethasone lotion is a medication used to treat various skin conditions such as eczema, psoriasis, and dermatitis. It contains betamethasone valerate as the active ingredient, which is a synthetic corticosteroid. The medication works by reducing inflammation and itching in the affected area. Betamethasone lotion is applied topically to the skin and is available in various strengths and formulations. It is important to follow the instructions provided by your healthcare provider or pharmacist when using this medication.