Hair loss has many causes, and the cause determines the treatment. This seems obvious, but it’s where management most often goes wrong — patients try minoxidil for hair loss that isn’t androgenetic alopecia, or receive a diagnosis of stress-related shedding when what’s actually happening is early scarring alopecia destroying follicles permanently. An accurate diagnosis is the essential first step before any treatment makes sense.
A dermatologist evaluates hair loss through a combination of the pattern and distribution of loss, the condition of the scalp, the character of individual hairs under magnification, and when needed, laboratory tests or scalp biopsy. The history matters enormously — when it started, whether it was gradual or sudden, what other health events coincided with it, current medications, and family history.
Common types we evaluate and treat
Androgenetic alopecia — male or female pattern hair loss — is the most common type in adults, driven by a genetic sensitivity of hair follicles to androgens. In men it presents as the classic temple recession and crown thinning. In women the pattern is typically diffuse thinning over the crown with a widening part, with the frontal hairline often preserved. It’s progressive and permanent without treatment. Minoxidil slows progression and supports regrowth in many patients. Finasteride (for men) blocks the conversion of testosterone to DHT and is more effective at stabilizing loss than producing new growth. For women, spironolactone has similar anti-androgenic effects. None of these work permanently if discontinued — this is a condition of ongoing management.
Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, causing patchy hair loss. Presentation ranges from small, isolated patches that often regrow spontaneously to extensive loss — alopecia totalis (complete scalp hair loss) or alopecia universalis (complete body hair loss). Treatment options include intralesional corticosteroid injections for localized disease, topical immunotherapy, and JAK inhibitors for more extensive disease — a class of medications that has shown remarkable efficacy in severe alopecia areata in recent years.
Telogen effluvium is diffuse shedding triggered by a physiological stress — illness, surgery, significant weight loss, childbirth, or major emotional stress — that shifts a large proportion of hairs simultaneously into the resting (telogen) phase. The shedding typically begins two to four months after the trigger and can be alarming in volume, but in most cases resolves on its own over several months. The key is identifying the trigger, confirming the diagnosis, and reassuring the patient that the loss is not permanent.
Scarring alopecias — including lichen planopilaris, frontal fibrosing alopecia, and discoid lupus — are a more serious group in which the inflammatory process destroys hair follicles permanently. Hair lost to a scarring alopecia does not regrow. Early diagnosis and treatment to arrest the inflammation is the primary goal. If you’re noticing recession of the frontal hairline with follicular dropout, prompt evaluation is important.
Frequently asked questions
When should I see a dermatologist versus waiting to see if it improves?
If you’re noticing a change in hair density, a widening part, patchy loss, or recession that you haven’t seen before — particularly if it’s been progressing over months — come in rather than waiting. Many types of hair loss are easier to address when caught early, and the scarring alopecias cause irreversible damage that progresses until the inflammation is addressed.
Do I need blood tests?
Sometimes. Thyroid dysfunction, iron deficiency, and nutritional deficiencies can contribute to or cause hair shedding. We order labs based on the clinical picture — not reflexively for everyone, but when the history or presentation suggests a systemic cause.
Will I need a scalp biopsy?
A scalp punch biopsy is particularly useful when scarring alopecia is suspected or when the clinical picture doesn’t clearly point to a diagnosis. It’s a small procedure done under local anesthesia that provides significant diagnostic information. We recommend it when it will change management.