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Using a hand cream with SPF 25 and exfoliation helps, but there are many effective treatments to help correct the signs of ageing. You can have a combination of treatments to reverse visible imperfections or pick and choose a treatment to best address the concerns that you have.
For discolouration and brown age spots a course of intense pulsed light treatments can help significantly. The brown discolouration will be lightened with each session. If deeper pigmented spots is your main concern, powerful lasers such as the Q-switched Nd: YAG or alexandrite laser can lighten them very effectively.
If you have sun damage generally, then fractional CO2 laser peel can provide global improvement with some downtime.
Restylane Vital® is also commonly used for hand rejuvenation. Three sessions at monthly intervals can provide dramatic results as shown here. These also have a preventative value as HA has been shown to have antioxidant action.