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SourcesThe studies behind what we say about razor bumps
Where this comes from.
3 claims · 5 studies.
C7-1
Nd:YAG laser is safe and effective for PFB on Fitzpatrick IV-VI skin; other wavelengths risk burns or paradoxical pigmentation.
They asked
Whether a long-pulse Nd:YAG laser reduces razor bumps on dark skin without harming it.
How26 people with skin types IV–VI whose bumps hadn't responded to treatment. One side of the neck was lasered, the other left alone; bumps were counted a month later.
They foundAbout 12 bumps on the treated side against about 30 on the untreated side, one month on. The authors call it safe and effective.
Small, one month, one clinic, and a side-by-side design — good evidence that it works in the short term, on 26 people. No one has told us what it looks like a year later.
The record
Treatment of pseudofolliculitis barbae in very dark skin with a long pulse Nd:YAG laser.
They asked
Which lasers can remove hair on darker skin safely, now that longer wavelengths and better cooling exist.
HowA review of the laser types and settings, by a dermatologist at Howard.
They foundLong-pulsed diode and Nd:YAG lasers, used with conservative settings and more sessions, are the ones suited to darker skin — including for razor bumps.
A review, so it gathers rather than tests. It agrees with Ross on the wavelength, which is why the two sit together.
C7-2
With-the-grain shaving and single-blade/foil razors are the standard mechanism-based recommendation for PFB; direct comparative clinical evidence is limited and partly mixed — a consistent regimen with pre/post-shave care may matter as much as blade count.
They asked
Whether the usual advice for razor bumps — shave less, use one blade — actually holds up.
HowA review: the authors read the existing studies rather than running a new one.
They foundThere isn't robust evidence that one blade beats many, or that shaving less helps. One recent study found daily shaving with a multi-blade razor didn't make it worse when it was part of a routine, and early evidence says wetting before and moisturizing after may help.
This is a review, not a trial, and it says plainly that the trials needed haven't been done. Our one-blade advice is mechanism, not settled evidence; the routine around the shave is the better-supported part.
VerifiedOne source behind this claim
The record
Pseudofolliculitis barbae: understanding the condition and the role of facial grooming.
C9-5
Keloid formation is significantly more prevalent in Fitzpatrick IV-VI populations.
VerifiedOne of 2 sources behind this claim · see the other
The record
Multi-ancestry meta-analysis of keloids uncovers novel susceptibility loci in diverse populations.
VerifiedOne of 2 sources behind this claim · see the other
The record
Keloid disease: Review with clinical atlas. Part I: Definitions, history, epidemiology, clinics and diagnosis.