Verbatim response from Perplexity
It is often too late to regrow hair with medication only when the follicles are no longer active—for example, when the scalp is smooth, shiny, and has no visible peach-fuzz or miniaturized hairs, or when hair loss has progressed to scarring (scar tissue replacing follicles). In contrast, if there is still thinning hair or vellus hairs, treatment can still help, especially if started earlier.[1][6][11]
What this means in practice:
- Still potentially treatable: early thinning, shedding, or areas with fine/miniaturized hairs; these follicles may still respond to treatments like minoxidil or finasteride.[1][6][9]
- Often not medically reversible: completely bald, smooth areas with no follicular activity, or hair loss from scarring alopecia where follicles are destroyed.[1][10][11]
- Timing matters: the longer hair loss has been present, the less regrowth is usually expected, and waiting can reduce options for maintaining density or transplant candidacy.[4][7][9]
You should see a doctor or dermatologist promptly if hair loss is sudden, patchy, painful, itchy, scaly, or associated with redness or other body symptoms, because those can signal treatable causes or scarring conditions where early treatment helps prevent permanent loss.[10][11]