The lesions, known as Mollusca, are small, raised, and usually white, pink, or flesh-colored with a dimple or pit in the center. They often have a pearly appearance.
[cdc.gov]
Cheesy (caseous) material fills the dimple's core. A pox virus causes the rash, which is commonly spread by person-to-person contact among children and young adults.
[medical-dictionary.thefreedictionary.com]
Have a dimple in the center. Are initially firm, dome-shaped, and flesh-colored. Become softer with time. May turn red and drain over time.
[my.clevelandclinic.org]