Age spots on the back of the hands in young people generally refer to seborrheic keratosis, which may be associated with a variety of risk factors, including genetics, sun exposure, and medications. Seborrheic keratosis, also known as age spots, can occur at any age, but mostly in the elderly. Its etiology is unknown, and it mainly manifests as small, soft skin growths on the face, back of hands, chest and back, and limbs. Age spots on the back of the hands in young people may be related to a variety of risk factors such as heredity, sun exposure, drugs and so on. 1. Heredity: some types of seborrheic keratosis can be associated with genetic factors, and people with family history are the most common people with this disease; 2. Sun exposure: long-term sun exposure is one of the high-risk factors for this disease, and patients often show multiple seborrheic keratoses in the sun-exposed areas, and in the early stage, they mostly show sunlight freckle-like nevus; 3. drugs: biological agents such as adalimumab and antitumor drugs such as polyene paclitaxel, cytarabine and vincristine may cause seborrheic keratosis; 4. Tumor: some patients with seborrheic keratosis may be the external skin manifestation of some malignant tumors. It is recommended that patients with the above factors should consult a doctor in time to clarify the cause of the disease and give targeted treatment.