HI thanks for writing here.Oily skin is secondary to sebum secretion in body leading to pimples dulness of face.Also since you are hypothyroid this will also lead to blackening and dulness of your face.Always use aoil control soap or aface wash like cetaphil
cleansing lotion for face wash.Drink plenty of water and consume fresh fruits .You can take oral antioxidants
for 1 to 2 months.Strict sun protection is must,try niltan cream at night ,stop skinlite
as it has many side effects.You can consult a dermatologist
and go for chemical peel,it will improve your skin tone .Take care.