Even skin tone isn't about "perfect" skin, it's about understanding how your skin responds to light, heat, hormones and inflammation. Pigmentation patterns tell a story about your skin's history and how it adapts.
Dr. Alice Rudd
Head of Skin Science · MBBS Monash University·6 November 2025·5 min read
Even skin tone isn't about "perfect" skin, it's about understanding how your skin responds to light, heat, hormones and inflammation. Pigmentation patterns tell a story about your skin's history and how it adapts.
Stella tracks these changes over time so you can see what's stable, what's shifting, and what needs consistency rather than intensity.
1. Hyperpigmentation
This refers to any area that appears darker than your natural baseline skin tone. It can be influenced by sun exposure, past breakouts, inflammation, hormones or genetics.
Stella looks at how deep the colour is, where it appears, and how it changes week to week. This helps you understand whether you need gentle brightening, barrier support or simply more daily protection.
2. Sun Spots (Solar Lentigines)
These are distinct brown spots caused by long-term UV exposure. They're a sign of photoaging and usually appear gradually.
They tend to respond slowly to routines, which is why prevention and protection matter more than aggressive correction.
3. Hormonal Pigmentation
Some pigment appears in more diffuse, symmetric patches, often across the cheeks, forehead or upper lip. This pattern is influenced by internal rhythms and sunlight.
Stella doesn't label or diagnose, it simply tracks intensity and movement over time, so you can see how gentle consistency affects change.
4. Freckles
Freckles are small pigment spots that naturally darken with sun exposure and fade when light exposure decreases. They're normal, and part of your natural tone pattern.
Freckles behave differently from sun spots, which is why tracking matters.
5. Your Skin Tone
Stella establishes your personal baseline tone so changes are measured relative to your skin, not a universal standard. This allows routines and product suggestions to match your natural tone and how it shifts across seasons.
6. Layered Pigmentation
Most people have more than one type of pigmentation at once, for example, freckles plus sun spots, or past breakout marks plus hormonal patches.
Because each behaves differently, Stella looks at them separately and together to show how they overlap and evolve.
Prevention Before Correction
Pigmentation is influenced by sunlight more than anything else. That means daily protection is foundational, consistency matters more than intensity, and small improvements add up over months.
The key insight
Tracking tone helps you see progress clearly, even when it's gradual. Small, consistent changes over months are more meaningful than dramatic short-term shifts.
The information in this article is for educational purposes only. Stella is not a medical device and does not diagnose or treat any skin condition. If you have a skin concern, please consult a qualified healthcare professional.
Dr. Alice Rudd
Head of Skin Science · MBBS Monash University
Alice leads the science and dermatology team at Stella. She trained at Monash University and practised in clinical dermatology before joining Stella to develop the metrics framework that underlies the app.
