💡 Quick answer
Photograph the part. Do not invent a third daily coat for the temples.
Questions answered here
Key termsFinasteride
Patterned loss is often a field, not a single furrow. Runoff to the face is hypertrichosis. Pets licking a wet stripe is the pet-toxicity file. This is not medical advice.
Do not start finasteride because the part still shows. Related: foam-vs-liquid.
Eye exposure or a child who used the dropper is emergency or labelling care. This is not medical advice.
Try the free self-check →📚 Sources
Sources: AAD ↗
FAQ
Only the white line?
The carton is a scalp amount, not a highlighter pen. Ask a clinician how they map your pattern.
More foam on a tiny part?
No. Extra coats are irritation. Follow millilitres.
Whole scalp “just in case”?
Not a licence to exceed the carton. Unused scalp is not a third indication.
Same as foam after exercise?
Timing versus where you paint. Two URLs.
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Not medical advice. General education only; it does not replace diagnosis or treatment by a licensed professional. Consult a board-certified dermatologist before starting, stopping or changing any treatment.
⚠️ When to see a doctor — don’t self-treat
- Sudden patchy or circular bald spots
- Redness, scaling, pus, pain or itch (possible scarring alopecia — treat urgently)
- Broken hairs or rapid loss
- Loss with body-wide signs (weight loss, fatigue, cycle changes, acne, extra hair)
- Loss right after a new medication
- Any hair loss in a child