-There are 4 stages of the Sarcoptes scabiei life cycle: egg, larva, nymph, adult
1. Following copulation, females lay eggs as they burrow underneath the host's skin. Eggs are laid every 2-3 days.
2. Incubation time varies from 3-4 days.
3. When the eggs hatch, the larva (which only have 3 pairs of legs) migrate to the skin surface and take residence in short burrows called molting pouches. The larval stage lasts for 2-3 days.
4. Larva molt into nymphs, which are slightly larger and have the full 4 pairs of legs.
5. Adult mites are round and sac-like. The cycle commences again when a nomadic male penetrates the female's burrow and, fertilized, she proceeds to lay her eggs in the host. (Scabies, CDC)