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.
Melasma Treatment and Hormones. Melasma is a condition that involves the discoloration of the skin usually on the face. Melasma is a result of too much exposure to sunlight. Melasma patches appear on the nose, lips, upper cheek, upper lip and the forehead. It mostly occurs in women than men. Genetic predisposition and hormonal imbalance plays a major role to determine if one will develop Melasma or not.