Alopecia trackerComing soon
A patch, in millimetres.
Patchy loss changes shape as well as size, and it can go either way. This measures the area of a patch in real units and keeps the series, so “is it growing?” has an answer that is not a feeling.
Not in the app at launch. This page describes what it is being built to do; leave your email and we will tell you when it ships.
What it does
- Measures the outlined area of a patch in real millimetres, not in pixels and not relative to your head.
- Keeps every reading, so growth and regrowth both show up as a line rather than as an impression.
- Works alongside the zone scans, so a patch inside a zone does not disappear into that zone's average.
How the reading is taken
- You outline the patch on screen, and lay a coin flat on the skin beside it.
- The coin is the scale reference. Its real diameter is known, so the pixels in the outline convert to millimetres.
- Without that reference the area is unitless and can only ever be compared with itself — which is why the app asks for it every time rather than making it optional.
What it will not do
It measures an area. It does not diagnose, it cannot tell alopecia areata from any other cause of a bare patch, and a patch that is new, spreading or on a child belongs in front of a dermatologist rather than in an app.
Tell me when it ships
Not in the app at launch. This page describes what it is being built to do; leave your email and we will tell you when it ships.