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, also called as Chloasma faciei or the mask of pregnancy, is a tan or discoloration of the skin. In other words, melasma can be defined as patchy brown or dark brown skin discoloration. The patches can occur on sun exposed body parts but mainly seen on the face.