There are 4 options that we are aware of, as far as skin whitening treatments are concerned:
Chemical peel (Rs. 1,800-5,500): An exfoliating solution which constitutes of alpha-hydroxy acid will be applied to your skin, it will work on the upper damaged layers and combat melanin pigment within, thus revealing healthy tissues as a result. This concentration strength will be light, medium or deep, and work effectively on blemishes, dark spots and uneven skin tone.
Laser (Rs. 4,000-30,000): This procedure will make use of an intense ray of light to minimize melanin within your skin. Thus causing your skin to become healthier and brighter than before, it will remove tanning and dark spots.
Injections (Rs. 6,000-40,000): can detoxify the body, it can barricade your skin from harmful UV rays and enhance its tone. But it will use a dosage of glutathione, which can be unsafe and have severe side effects too.
Skin lightening products (Rs. 200-20,000): This option will provide you with a wide range of creams that have bleaching properties. These won't deliver long lasting results but will give some results with regular application.
You are required to approach a dermatologist to avail above treatments, you can refer from our list of Skin Whitening Treatment doctors in Mumbai, or that of any other city, to get more information.
A doctor will know better how many number of sessions to conduct, same will possibly depend on skin issues, severity of concern and type of treatment you will be deemed fit for.