A hair follicle is a small pocket in your skin that grows one hair, sheds it, rests, and starts again. Almost every problem people blame on shaving is something happening inside that pocket.
This page explains what it is, the three things it can be doing that people come to us about, and where the honest limits of that explanation sit.
What are the three things a follicle can be doing wrong?
| State | What's happening in the follicle | What you see |
|---|---|---|
| Release | The hair is growing normally, but the exit is blocked or the shaft has curled back under the surface. Nothing is wrong with the growth. | A raised bump, sometimes with a dark hair visible under the skin. Redness. Often three days after a wax or shave. |
| Reduce | The hair is growing perfectly well, out of a follicle that works. Nothing is malfunctioning. | More hair than you want, and coarser than you want, coming back quickly after removal. |
| Support | The follicle sits at a site where the growing phase is naturally very short, so hairs never reach much length before they shed. | Brows and lashes that stay short and sparse-looking however long you leave them. |
Three states of one structure. This is a way of describing follicle biology, not a claim about any product — the states share an anatomical target and nothing else.
Why does a hair grow back into the skin?
A hair is meant to grow up through the follicle and break through the surface. An ingrown hair is one that didn't. It either never broke through, or it broke through, curled over, and went back in.
Two things make that likely. The follicle opening is blocked by dead skin cells, so the hair has nowhere to go. Or the hair shaft is stiff or curved enough that when it does emerge, it turns back on itself.
That's the whole problem. It is not hygiene, and it is mostly not technique. It's follicle shape, hair texture, and the physics of a cut hair having a sharper tip than an uncut one. Curly and coarse hair gets it worse, which is why this has been a serious and under-treated issue for Black men in particular for decades — under a name most brands never bother to use: pseudofolliculitis barbae.
Read the full explanation of razor bumps →
What actually helps an ingrown hair?
Softening the hair shaft. A softer hair is less able to punch back into skin.
Keeping the follicle clear. Gentle, regular exfoliation. Not aggressive scrubbing — that inflames the follicle and makes it worse.
Not drying the skin out. Most drugstore treatments are alcohol-heavy. Alcohol dries the stratum corneum, which produces more dead cells, which blocks more follicles. The treatment feeds the problem.
Does ingrown hair oil actually work? →
Why does hair behave differently on different parts of your body?
This is the most interesting thing on this page, and it's textbook human physiology rather than anything ungro discovered.
The enzyme 5-alpha-reductase converts testosterone to dihydrotestosterone, or DHT. The enzyme does one job. What DHT does next depends entirely on which follicle it reaches.
On androgen-dependent follicles of the face, jaw, chest and body, DHT drives fine vellus hair to convert into coarse terminal hair. More androgen signalling at those sites means more hair, and thicker.
On genetically susceptible follicles of the scalp, the same DHT drives the opposite — progressive miniaturisation, terminal hairs cycling back toward fine, short ones. More signalling there means less hair, and thinner.
The clearest demonstration is finasteride, a 5-alpha-reductase inhibitor: it thickens scalp hair and reduces body hair, in the same person, at the same dose. One drug, one enzyme, opposite directional effects by site. That is third-party clinical data about a prescription medicine ungro does not sell, and it is included here because it's the cleanest illustration of the principle, not because it says anything about a cosmetic.
So "hair growth" is not one process at different intensities. It's different local programmes running on the same hardware. That is why no single product can honestly claim to act on all hair, and why the products on this site each stay in one lane.
The hair growth cycle, in full →
What does that mean for the products on this site?
Two things, and both are limits rather than promises.
The Ingrown Hair Oil works on a hair that is growing normally and can't get out. It has nothing to do with how much hair you grow.
The Smooth Gel works on hair that grows perfectly well and isn't wanted. It is used on the face and body, where androgen signalling adds hair — so an active marketed for reducing pilosity is at least directionally coherent there. That is a formulation rationale, not a result: the outcome data behind it is supplier data whose study design we have asked for and not yet seen.
Neither product is a hormonal treatment, neither acts on the scalp, and neither removes hair.
What kind of evidence sits behind any of this?
The follicle biology above is established human physiology. It isn't ungro's finding and it doesn't need our evidence.
Anything about an ungro ingredient is a different question, and we grade it in plain words on the ingredients page: what was found, what it was found in, and what that's good for. Most of our actives sit at cell-culture level. That is a genuinely good reason to choose an ingredient. It is a bad reason to promise you an outcome, and we don't.
No ungro formula has been tested on people for efficacy. A consumer assessment on the finished product would change that sentence, and it's the first study we intend to run.
What's in each product, and what kind of study is behind it →
When should you stop reading and see a doctor?
If a lesion is hot, swollen, spreading, weeping, or genuinely painful rather than annoying, that's likely folliculitis or an infection, and no cosmetic oil is the right answer. See your GP. We'd rather lose the sale.
If you are dealing with scalp thinning or hair loss, ungro has no product for that and won't pretend to. See a doctor.
If you think your hair growth changed suddenly, or came with other symptoms, that is worth a medical conversation rather than a cosmetic one.
Published by the ungro lab.