What skin lesion is a solid elevated less than 1 cm in diameter?

A papule is a solid elevated skin lesion less than 1 cm in diameter. Papules can be caused by a variety of factors, including inflammation, infection, and trauma. Some common examples of papules include acne vulgaris, warts, and moles. Papules can also be a sign of more serious conditions, such as skin cancer, so it is important to see a doctor if you have a papule that does not go away or is accompanied by other symptoms.