A lot of brown spots on the top of the feet may be related to seborrheic keratosis, post-inflammatory hyperpigmentation and other diseases. 1. Seborrheic keratosis: the cause of the disease is not clear, may be related to heredity, skin aging, gene mutation and other factors. Patients with light brown to black plaques can be seen in any part of the body except palms, soles and oral mucosa. 2. Post-inflammatory hyperpigmentation: the etiology may be related to disease factors, trauma factors, environmental factors and other reasons. Patients will have localized hyperpigmentation spots, which are dark brown, light brown, and so on. If inflammation has ever occurred on the top of the foot, it may cause the top of the foot to remain a brown spot. If there is a lot of brown spots on the top of the feet, it is recommended to go to the regular hospital for examination to clarify the cause of the disease.