Hi, Scratches on the legs can have various causes. Here are a few possible explanations for the scratches you re experiencing: * Skin irritation or dryness: Dry or irritated skin can be more prone to scratching and developing visible scratch marks. Itching can be triggered by various factors, including harsh soaps, certain fabrics, allergens, or environmental conditions. * Dermatitis: Contact dermatitis or allergic reactions to substances that come into contact with your skin (such as certain fabrics, lotions, or laundry detergents) can cause itching and scratching, leading to visible scratches. * Insect bites: Bites from insects like mosquitoes, fleas, or bed bugs can cause itching and scratching, resulting in scratch marks on the skin. * Skin conditions: Certain skin conditions like eczema or psoriasis can cause itching and scratching, leading to visible scratches and marks on the skin. * Psychological factors: It is also worth considering the possibility of a condition called dermatitis artefacta, which is a psychological disorder where a person intentionally creates or exaggerates skin lesions. This can be associated with underlying psychological distress. Since you mentioned that the scratches appear without any apparent cause and that you have noticed them since last fall, it may be helpful to consult with a dermatologist. They can examine your skin, take a detailed medical history, and provide a proper diagnosis. Based on the underlying cause, they can recommend appropriate treatment options or suggest ways to manage the itching and prevent further scratching.. Take care. Hope I have answered your question. If you require a personalized response, kindly use the Ask A Doctor service and post a follow-up query. Regards, Dr. Priyanka, General & Family Physician