Papules are small, raised bumps on the skin that are usually less than 1 cm in diameter. Some common synonyms for papules include nodules, pustules, pimples, and lesions. Nodules refer to small solid lumps that occur beneath the skin and are often painful to touch. Pustules are similar to papules but contain pus, while pimples are a milder form of papules that are typically caused by acne. Lesions are more general terms that refer to any abnormal area of tissue on the skin. It is important to note that while these terms are often used interchangeably, they may have different clinical meanings and should be used correctly depending on the diagnosis.