How long does a pimple can last on a penis before it disappears? like a red one and one with little white on top.

Pearly Penile Papule: PPP are small skin-colored papules that typically are located on the sulcus or corona of the glans penis. Commonly, PPP are arranged circumferentially in one or several rows and often are assumed wrongly to be transmitted sexually. PPP are considered to be a normal variant and are unrelated to sexual activity. Often, lesions cause great anxiety to patients until their benign nature is clarified.