Welcome to HCM.
'Hyper-pigmentation on upper part of left cheek'-it needs a proper clinical diagnosis before starting treatment. Common cause of this type of spot is melasma
. For management of melasma you could apply a sunscreen cream /lotion (e.g Spectraban) at morning and a 4% Hydroquinone
preparation (Eldopaque/ Eldoquinn forte) at every night on affected area.
You might required laser surgery
if your diagnosis would nevus of Ota or other conditions.
Therefore i suggest you to visit a dermatologist
before starting any treatment.