Before a blemish is visible, there are multiple factors that are conspiring to create it, including impactions and micro-comedones in the sebaceous follicles and inflammation and hormonal activity in the skin. Diet can play a large role.
When a blemish surfaces, it is important to reduce as much inflammation as possible and give the skin all the wound healing support it needs. The older a person is and the more compromised their skin health is, the slower the healing process is.
After a blemish stops being inflamed and swollen, it can still leave behind a bump, a scar or hyperpigmentation in the form of red or purple dots. At this stage encouraging cellular renewal and dermal matrix protein regeneration is key.
Even after hyperpigmentation fades (months after the blemish initially surfaced), scarring and collagen damage can remain (even invisibly). To the extent it is possible, supporting the key proteins of the dermal-epidermal junction is most beneficial for the skin at this point.