What is a common feature of wart appearance?

A common feature of wart appearance is that they manifest as small grainy bumps on the skin. This characteristic is due to the proliferation of skin cells stimulated by the human papillomavirus (HPV), which causes the typical texture of warts. Warts can vary in size and location but typically have a rough, bumpy surface and can present in clusters or as solitary lesions. The grainy appearance is often a distinguishing factor that helps in identifying warts compared to other skin growths, making choice B the most accurate description.