Dark Spots Treatment Hydroquinone 4%?

I would start with an intense skin rejuvenation protocol for age spots that includes fractional laser, Covalent chemical peels, and daily skin brightening creams to improve your skin’s complexion. Laser therapy must be combined with a proper skin regimen to enhance and maintain youthful results.
The following skincare products for dark age spots: Melarase
MelaClenz Brightening CleanserMelarase AM: Day-time skin lightener with SPF 30Melarase PM: Night-time skin lightenerMelapads: Daily Exfoliating PadsReplenish Retinoid Cream: Exfoliating and skin-stimulating night creamBest, 
Dr. Karamanoukian
Realself100 Surgeon

   Yes.  Unfortunately, after stopping HQ it is not surprising if the dark spots return, particularly if you are exposed to any sunlight.  Obviously, sun avoidance and sunscreens are important to prevent the recurrence of the dark spots.  Light to medium chemical peels or lasers would also be beneficial.

Treatment of hyperpigmented patches, particularly in ethnic skin requires strict daily sun protection, topical C product in the morning, combination of hydroquinone and prescription-strength retinoid may be appropriate for oily prone skin. For most patients with sensitive skin however, topical hydroquinone may not be easily tolerated and have to be preceded by light moisturizer 30 minutes prior. One may consider non-hydroquinone containing bleaching cream with active ingredients of arbutin, kojic acid, embilica, etc. As a last resort, we may offer Nd:Yag lasers such as GenesisPlus laser or Spectra laser.

Hydroquinone has been considered one of the most effective skin-lightening treatments for hyperpigmentation. No doubts, very often it becomes first line of treatment for patients with sun damaged skin, age spots or post-inflammatory hyperpigmentation. Nevertheless some researchers claim that it alters the melanin-protein complex, causing uneven skin tone. But that occurs predominantly in dark-skinned people.Sunscreen plays an important role in everyday life, especially, if you use skin-lightening products.Please, apply a sunscreen before leaving your house, do not let your treatment go to waste from damaging UV rays.

Treating dark spots depends on your skin type and complexion.  The most important thing to remember is that whatever treatment you receive, you need to stay out of the sun and always use SUNBLOCK with a high SPF.  Fraxel and Yag lasers both work very extremely well for dark spots.  Hydroquinone and other bleaching agents including non-hydroquinone products also help a great deal in treating dark spots but it can take several weeks to months and it is best to combine that with other treatments like chemical peels or products like Retinoids to achieve the best benefit.  There are a myriad of treatments but it is  important to find someone experienced with cosmetic dermatology.