A circle of hard things growing on the penis without pain or itching may be the presence of pearly penile papules, which are related to physiological developmental variants, poor hygiene, chronic inflammatory stimuli and other factors. 1. Physiological developmental variations: pearly penile papules may be related to physiological developmental variations, and some men may have pearly penile papules without any obvious triggers, without any self-awareness of the symptoms, and do not need to be treated. 2. Poor hygiene: infrequent bathing, but also not often wash the penis, due to the presence of dirt for a long time, the penis area for a long time stimulation, it is easy to induce pearly penile papules. 3. Chronic inflammation stimulation: men have a long prepuce or prepuce, repeatedly induced by the prepuce glans, by chronic inflammation stimulation, it is also easy to make the penis pearly penile papules. When the pearly penile papules secondary bacterial infection, may cause pain, itching and other symptoms, it is recommended to seek medical examination and treatment.