Exfoliants
Undertow
2% Salicylic Clarifying Fluid
4.7 · 2,264 reviewsRated 4.7 out of 5 from 2264 reviews
£4830 ml
Restocked
Targeted
Signal
Overnight Blemish Concentrate
4.5 · 987 reviewsRated 4.5 out of 5 from 987 reviews
In stockA spot treatment strong enough that it is sold in a 15 ml bottle on purpose.
- Use
- PM
- Strength
- Advanced
- Size
- 15 ml
- Visibly flattens an active blemish overnight
- Dries down in ninety seconds — no transfer to bedding
- Deliberately small, because it should not be used generously
1
£37 more for free delivery
Order before 4pm UK time and it ships today
90-day returns, opened or not
TreatsBlemishes
Measured results
- 1 night
- To visible flattening
- Self-assessed, n=142
- 90 s
- To full dry-down
- Measured at room temperature
- 15 ml
- Deliberately small
- Spot use only
What is doing the work
Key actives, at declared doses
Everything below is listed as a percentage of the finished formula, not as a position on an ingredient list.
- 01
5%
Benzoyl Peroxide
Kills the bacteria driving the lesion
- 02
3%
Colloidal Sulphur
Draws out congestion and reduces swelling
- 03
1%
Salicylic Acid
Keeps the pore clear as it heals
How to use
In this order, at this cadence.
PMAdvanced15 ml
- 01
Spot application only. Never across the full face.
- 02
One thin layer on the blemish at night, on clean dry skin.
- 03
Do not use with a retinoid on the same spot on the same night.
- 04
Benzoyl peroxide bleaches fabric — use a white pillowcase.
What it looks like
The bottle, the texture, the routine
Photography that shows the product as it actually arrives and how it goes on.
Signal unboxed, 4:5
Signal texture on skin, 4:5
Signal in a routine, 4:5
Batch code
AX-BPO5
Size
15 ml
Made without
Fragrance, dyes, essential oils
Directions & disclosure
Everything on the box, and then some.
Batch AX-BPO5 · Certificate of analysis available on request
Aqua, Benzoyl Peroxide, Sulfur, Glycerin, Salicylic Acid, Dimethicone, Zinc Oxide, Allantoin, Bentonite, Xanthan Gum, Sodium Hydroxide, Phenoxyethanol.
Fragrance-free, essential-oil-free and dye-free. Never tested on animals.
Compare
Every targeted formula, side by side
Same category, different strengths. The right one is usually the gentlest that still does the job.
| Formula | Strength | Use | Size | Price | |
|---|---|---|---|---|---|
| Stillwater10% Azelaic Acid Suspension | Moderate | AM / PM | 30 ml | £54 | View |
| First LightCaffeine + Peptide Eye Serum | Gentle | AM / PM | 15 ml | £62 | View |
| SignalOvernight Blemish Concentrate | Advanced | PM | 15 ml | £38 | You are here |
Reviews
What people report back
4.5
4.5Rated 4.5 out of 5
987 reviews
- 5 star72%
- 4 star19%
- 3 star5%
- 2 star2%
- 1 star2%
- 5.0Rated 5 out of 5
Flattens a spot overnight
Dries in about a minute and does not transfer. Use a white pillowcase — the bleaching warning is not a joke.
- 4.0Rated 4 out of 5
Strong, so spot use only
I tried it over a wider area once and regretted it. On a single blemish it is excellent.
Questions
Before you buy it.
Not covered here? Our team answers within one working day.
Layers well with
Complete the routine
Barrier & Peptides
Baseline
10% Niacinamide + 1% Zinc
4.7 · 3,388 reviewsRated 4.7 out of 5 from 3388 reviews
£4230 ml
Barrier & Peptides
Fieldstone
Ceramide Barrier Serum
4.9 · 2,976 reviewsRated 4.9 out of 5 from 2976 reviews
£5830 ml