Dark brown warts on the face may be due to common warts and seborrheic keratosis. 1. common warts: infection with human papilloma virus can cause common warts on the face, which can cause papillomatous growths, soybean-sized or larger gray-brown, brown or skin-colored pimples, with a rough surface and hard texture. 2. seborrheic keratosis: facial black-brown warts may also belong to seborrheic keratosis, the most common benign epidermal hyperplastic tumors for the elderly, the disease will appear in the skin similar to the raised black, black-brown growths. There are a lot of reasons for black and brown warts on the face, and it is recommended to go to the hospital in time after the symptoms appear, and give standardized treatment after a clear diagnosis, do not ignore the symptoms, so as to avoid delaying the treatment of the condition, and do not privately deal with it, so as not to induce the adverse consequences.