There are several possibilities for men with itchy bottoms: one possibility is eczema, which is scrotal eczema. There may also be ringworm, or folliculitis of the vulva. Of course there may be other factors that can cause fungal infections, or parasitic infections, such as pubic lice, which are possible. If there are no special symptoms, it is recommended to take a little oral anti-allergy medication first, that is, anti-itch medication, you can take oral loratadine or levocetirizine, or ibastine, etc., these drugs are one a day, you can choose any one. If you take it orally for a few days or less than a week, if there is no significant improvement, try to go to the hospital to see again, in case there is an infection, you need timely anti-infection treatment, which is very important.