Agent: molluscum contagiosum virus, a member of the pox virus family.
Incubation: 2-7 weeks.
Clinical: patients may be all ages; appearance is multiple discrete dome-shaped papules with central umbilications (image A), through which milky-white fluid may be expressed under pressure.
Image C (click on the image above)
Image D (click on the image above)
Characteristic cup-shaped invaginations.
Cells of the stratum malphigi acquire cytoplasmic inclusions that progressively enlarge as they reach the surface: these molluscum bodies (Henderson-Patterson bodies) contain viral particles and are eosinophilic, but become more basophilic and granular as they enlarge and displace the nucleus (image B), (image C), & (image D).
Treatment: podophyllin or silver nitrate or laser vaporization.