Melanocyte-stimulating hormone describes a group of hormones produced by the pituitary gland, hypothalamus and skin cells. It is important for protecting the skin from UV rays, development of pigmentation and control of appetite.

What causes hormonal pigmentation?

You may have first noticed your pigmentation appear after taking the oral contraceptive. It can also be stimulated by hormone replacement, intrauterine devices and implants, pregnancy, hypothyroidism (when your body doesn't produce enough thyroid hormones), and certain medications.

Which hormone causes pigmentation on face?

“Melasma likely occurs when the pigment producing cells in the skin (melanocytes) produce too much pigment (or melanin),” Dr. Keira explains. “The underlying hormone responsible for triggering the melanocytes is melanocyte stimulating hormone (MSH).