Ageing is of two major types namely intrinsic ageing and extrinsic ageing. Intrinsic ageing is genetically programmed whereas extrinsic ageing is due to environmental factors like sunlight, stress, pollution, smoking, disturbed sleep patterns, etc. As you age, the creases, folds and ridges form in your skin and are called as wrinkles. Due to the natural ageing process, the skin loses its strength to protect itself from damage as it becomes thin and loses its elasticity and volume. This is mainly due to rapid degradation of supporting proteins, namely collagen and hyaluronic acid.
Wrinkles can be classified primarily into Surface Lines and Deep Furrows. The basic treatments like botulinum toxin are sufficient for surface lines but for deep furrows, a different approach is required. Wrinkles may be dynamic (in expression) or static (at rest).