Weed, insect, and disease control may also be required for pastures. A healthy, productive pasture will resist invasion from most poisonous weeds and provide good quality forage. When pastures are overgrazed, horses will eat the grass and legume species down to the soil, which allows weeds to take over.
1 Melasma can be triggered by birth control pills because it increases hormones throughout the body. # 2  This is one of the most common causes of melasma. 3  Pregnancy: During pregnancy the body will become very hormonal and skin conditions like acne vulgaris and melasma/chloasma become very common.
What is Melasma. Melasma is said to be a form of pigmentation on the face usually mistaken for a tan. Melasma often appears around the cheeks, forehead, upper lip, nose, chin, and jawline. It also may appear on the forearms, but this is quite rare.