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: Blotchy patches of darker color often appear on the cheeks. The woman on the right developed the brown patches while pregnant. Melasma: Signs and symptoms . Common signs (what you see) of melasma are brown or gray-brown patches on the face. These patches most commonly appear on the: Cheeks. Forehead. Bridge of the nose. Above the upper lip. Chin. Some people get patches on their forearms or neck. This is less common. Melasma does not cause any symptoms (what people feel).