The crown groove long meat grain can be considered to be the foreskin glans, penis pearly pimples, warts and eczema, etc., it is recommended to go to the hospital in time for further examination, to clarify the cause of the disease to take medication, surgery and other treatments. 1. If there is a long prepuce and prepuce, then for the coronary groove appeared small meat grain is considered to be due to the lack of timely cleaning and so on, resulting in the accumulation of foreskin scale and chronic stimulation caused by the glans penis, you can use water to thoroughly clean, external mupirocin ointment and other drugs, if you want to remove the pimples can be chosen to laser, cryotherapy, and so on. 2. If there is a history of unclean sex, it can be considered infected with warts, infectious molluscum contagiosum and other sexually transmitted diseases, it is recommended that the application of imiquimod ointment, as well as laser, frozen removal, as well as surgical removal of warts and so on. 3. In addition, if you usually do not pay attention to cleaning after a lot of sweating, long-term in a humid environment, infection, allergies and so on may lead to the emergence of penile pearly pimples, eczema, it is recommended that you can use 3% of the boric acid solution to wash, topical Eloxon ointment and so on the treatment. Therefore, it is recommended to go to the hospital in time for further examination, under the guidance of the doctor to carry out the relevant treatment, the drug should be applied under the guidance of the doctor.