Striated hard lumps in the coronal sulcus may be associated with cavernous sclerosis of the penis, blood clots, and pearly penile papules. 1. Scleroderma: Fibrosis of the collagen fibers in the cavernous body of the penis, resulting in one or more hard plaques on the penis, which may grow close to the coronal sulcus. 2. Thrombosis: penile erection is the accumulation of large amounts of venous blood in the cavernous sinus causing an erectile state. If sexual intercourse time is prolonged more than half an hour later, sharp venous blood may be formed in the local venous stagnation, the penile coronal groove localization because of the formation of thrombus for a long time can not be dissolved, the formation of local mechanization, may also form a hard plaque. 3. pearly penile papules: the skin is subjected to long-term chronic stimulation by urine, sebum, bacteria and circumcision scale and other common and chronic stimulation and the formation of papules. There may be strings of papules in the coronal sulcus that are not fused to each other. In the presence of striated hard lumps in the coronal groove, it is recommended to seek medical examination in time to clarify the cause with the help of a doctor and to treat it.