Concise answer
Dull-looking skin can reflect dehydration, rough texture, irritation, sun exposure, pigment, sleep or normal variation in how light reflects from the face. More products are not always the answer.
Frequent exfoliation may briefly feel smooth while gradually increasing sensitivity and uneven colour.
A consistent barrier-supportive routine and an assessment of the main concern are more useful than chasing an undefined glow.
When evaluation may help
Review may help when dullness is accompanied by persistent pigment, acne, rash, scaling or a sudden change in general health.