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 is a common condition that produces brown or gray patches on the skin. Melasma usually affects skin on the face, though it may also appear on any part of the body that is frequently exposed to the sun. Wearing sunscreen and protective clothing can help prevent melasma. See your dermatologist if you have any new or suspicious spots or marks on your skin.