Warts and molluscum are both caused by viruses infecting the skin. 

Wart:

• Warts are usually raised and rough, but may be flat or smooth. There are several types of warts based on their location. Plantar warts occur on the surface of the feet and may cause pain and discomfort. Warts can spread to other areas of the body and are contagious. They can cause emotional stress and embarrassment.
• Recurrence is frequent requiring follow-up treatment because the wart virus can infect the normal surrounding skin while being unapparent to examination. The most common treatments include cryotherapy (freezing), Immunotherapy, acid treatments, surgical excision or topicals such as podophyllin, cantharidin (blister beetle juice), bleomycin or squaric acid.

Molluscum:

• Also known as Molluscum contagiosum. Molluscum is most common in children who are 1 to 10 years old. As the name suggests, molluscum is contagious..
• Molluscum clears over time, but can leave behind scars.
• Small, painless, dome-shaped papules. They may appear anywhere on the body except the soles of the feet and palms of the hands.
• The papules may occur in lines, where a person has scratched and caused them to spread.
• Treatment may be recommended if the bumps are painful, itchy, or infected with bacteria. There are multiple treatment options for Molluscum. Treatment can also be helpful when a child is likely to spread molluscum to other children or has eczema. 

For more information please visit aad.org.