Concise answer
A part that becomes progressively wider in comparable photographs deserves assessment, particularly when there is reduced volume, increased shedding or a family history of pattern hair loss.
A widening part can result from follicle miniaturisation, diffuse shedding, breakage or more than one process at the same time.
Early evaluation helps distinguish a temporary cycle change from progressive thinning and prevents treatment based only on guesswork.
When evaluation may help
Book a consultation if the change persists for several weeks, advances quickly or occurs with scalp inflammation or patchy loss.