Greetings,Warts are benign skin growths caused by viruses. Most come from the human papillomavirus (HPV), which infects the top layer of skin and causes it to grow rapidly, creating a wart.These can grow on the face, arms, and legs. They're small, have flat tops, and may be light yellow, brown,there are several option to remove depends on conditions such as cryotherapy, medicines, cuatery ,chemical peels,laser and surgical .Regards Dr shuhaib MP