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.
Chronic bullous dermatosis: This medical condition results in development of blisters on the mouth, face and/ or the genitals. Cutaneous radiation syndrome (CRS): A condition caused by skins exposure to radiation, which enters deep into the tissues and causes blisters on the affected skin area.