Clear skin isn't just about whether you're breaking out today. Stella tracks clarity across multiple signals, from pore visibility to healing speed, to show what's happening both above and below the surface.
Breakouts come in different forms, appear in different zones and change over time. By understanding which type you're seeing and where it appears, you can adjust your routine with more confidence and less guesswork. The underlying biology starts well before a lesion is visible: reviews of acne pathogenesis describe comedogenesis as a multi-week process driven by sebaceous stem cell activity and pilosebaceous duct changes, which is why most breakouts were forming beneath the surface days before they appeared (Saurat, 2015).
1. Clarity & Breakout Types
Not all breakouts behave the same. Stella distinguishes between comedones (blackheads and whiteheads), papules and pustules (red, inflamed bumps), and deep breakouts (under-the-surface, tender spots).
Each follows a different pattern, and each responds better to different routine approaches.
2. Clogged Pores (Comedones)
These form when oil and dead skin build up inside a pore. They're considered non-inflamed, meaning they're more about congestion than irritation.
3. Red, Swollen Bumps
These are papules and pustules, breakouts with visible inflammation. When these appear, it's less about buildup and more about how the skin is reacting.
Stella watches how these areas change over time: are they lasting longer or clearing faster? Do they flare during stress or cycle shifts? Are the same zones repeating? Patterns here help guide how gentle or active your routine should be.
4. Pore Size & Density
Pores are not "flaws", they're openings for oil to reach the surface. Larger or more visible pores often reflect natural oil levels or genetics.
Stella measures pore size (how visible each pore appears) and pore density (how clustered they are in different regions). Tracking these signals helps determine whether to focus on balance, exfoliation rhythm or hydration support.
5. Post-Breakout Marks
After a breakout heals, it often leaves a flat pink or red mark. These are post-inflammation marks, different from dark pigment spots.
They fade gradually over time. Stella tracks how long they take to settle, whether new marks are appearing faster than old ones fade, and which regions of the face are most affected. This helps you see healing progress even before the skin looks fully even.
6. Where Breakouts Show Up
Location provides extra context. The T-zone (forehead, nose, chin) is often linked to oil balance and environment. The cheeks and jawline can reflect internal rhythms like stress or cycle shifts.
By mapping where breakouts appear, Stella helps identify triggers and pattern cycles over time.
The Goal
Breakouts don't define your skin, your trend does.
Stella shows you whether breakouts are becoming less frequent, inflammation is settling faster, marks are fading predictably, and your pores are looking clearer over time.
When you can see the pattern, you can make calm, confident decisions, without reacting to every single day.
ToolRoutine Analyzer: Check what your routine covers→ToolCycle Skin Audit: See if breakouts follow a pattern→
Dr. Alice Rudd
Cofounder · Skin Science · MBBS Monash UniversityAlice is a Stella co-founder and dermatologist. She trained at Monash University and brings clinical experience to Stella’s measurement framework and scientific boundaries. She also runs Skindepth, a Melbourne dermatology practice.