1 The results of prophylactic measures for femoral head AVN have considerable variation, but certain generalizations can safely be stated. 2  Namely, the clinical results of core decompression alone deteriorate with more advanced lesions.
1 Melasma is very common skin ailment. It can occur to anyone, but young women with brownish tone are more likely to contract with it.  The condition is often linked with female hormonal changes. Change in level of estrogen and progesterone may cause melasma.
Hormonal Regulation. There are several factors that can trigger the hormones that cause senescence in plants. Some are environmental factors, such as drought, or the changing of seasons. Senescence can also be triggered in only a small area of the plant. This might happen if the plant became infected with a disease.