Are common warts on the back of the hand contagious?

Aug 24, 2022 Source: Cainiu Health
Disease description:

Today, I visited my grandma's house. While chatting with her, I noticed several red bumps on her arm. Grandma said she had them checked and was diagnosed with common warts. I'm wondering, are common warts on the back of the hand contagious?

Doctor's answer (1)
Dr. Huang Lingjuan
Common warts on the back of the hand are generally contagious. Excessive use of hands or skin abrasions may cause common warts to rupture, and touching them may lead to skin infection in others. Infection may also occur through contact with contaminated clothing, towels, toilets, or other shared personal items. Once infected, treatment with cryotherapy using liquid nitrogen is recommended, as it can accelerate the resolution of the warts. It is important to avoid scratching or irritating the warts on the back of the hand during daily activities.