Genital warts are caused by a virus called the Human Papiloma Virus (HPV). There are many serotypes of HPV. Some of them cause warts on the skin and some on the genital mucosa. Genital warts are sexually transmitted and should be taken very seriously because some serotypes of HPV may cause cervical dysplasia and cancer. Warts (mucosal or skin) do not contain pus. Those “red pimples with pus” on your legs are probably not warts but perhaps result from superficial folliculitis caused by a bacterial infection on the skin. You can see a dermatologist to check them out. A cream containing antibiotics and corticosteroids will be probably needed for treatment.