Which belong freckles blackheads moles melanin?

Melanin.

Freckles, blackheads and moles are all skin conditions that are caused by melanin. Melanin is a pigment that gives skin its color. Freckles are small, flat, brown spots that are caused by an increase in melanin production. Blackheads are small, dark bumps that are caused by a buildup of oil and dead skin cells in the pores. Moles are small, raised, brown or black spots that are caused by a cluster of melanocytes.