When do genital warts grow like what I see at google pictures? Ps. they are horrific. What causes those warts to grow like that?

Genital warts... ...usually remain small. People tend to post the most dramatic pictures. It isn't known why some become especially large or numerous, but most warts remain small and few in number. If you think you might have genital warts, see a doctor. And for sure get vaccinated, which will protect you against the virus types that cause most warts and cancer.