Most men who describe their skin as sensitive have made it that way.
Sensitive and sensitised are not the same thing
Genuinely sensitive skin is something you are born with — a thinner outer layer, fewer lipids holding it together, and nerve endings that report back sooner than most people's. It runs in families and it does not arrive suddenly at 34.
Sensitised skin is acquired. The barrier is the outermost layer of dead cells held in a mortar of lipids, and its job is to keep water in and irritants out. Wear that mortar down and both halves of the job fail at once: water leaves faster than it should, things that used to sit harmlessly on the surface now get through, and the nerve endings underneath start responding to input they previously ignored. Stinging after cleansing, a flush that takes 20 minutes to settle, tightness by mid-morning — that is a barrier under strain, not a permanent trait of your face.
The useful part is that sensitised skin usually recovers. It recovers by subtraction.
The triggers that do most of the damage
Very hot water. It dissolves surface lipids faster than warm water does, which is why skin often feels tightest straight after a long shower. Turn it down; your face will notice before your back does.
Cleanser strength. Strong surfactants are efficient at removing oil and indiscriminate about which oil they remove. Twice a day with something harsh will sensitise skin that was perfectly stable a month ago.
Fragrance and essential oils. These are among the most common causes of contact irritation in cosmetics, and "natural" tells you nothing about how a compound behaves on a compromised barrier. Citrus and mint oils are frequent offenders.
Alcohol high in the ingredient list — usually written as alcohol denat. In small amounts, low down, it is a formulation tool. Near the top of the list, in something you use daily, it tends to leave skin feeling dry and taut.
Exfoliation, done too often. Acids and scrubs work by removing surface cells. Do it three times a week on skin that is already reactive and you are removing them faster than they can be replaced.
Friction. Shaving against the grain, scrubbing with a towel, or dragging a rough flannel across the jaw does mechanical damage that no serum will offset.
August adds its own load: sweat sitting on the skin after a commute, air-conditioned offices pulling humidity out of the air, sun exposure, and the dry cabin air of a flight. None of these are catastrophic in isolation. Stacked on a barrier already thinned by a strong cleanser, they are what tips the balance.
Take things away before you add anything
The instinct when skin starts misbehaving is to buy something for it. The better move is to strip back to three steps and hold there for a few weeks.
A gentle cleanser at night, water alone in the morning if your skin is very reactive. The Doers of London Facial Cleanser is designed around that restraint: it should leave your face feeling comfortable rather than squeaky, because squeaky means it took more than it needed to.
A moisturiser applied to skin that is still slightly damp, which gives it water to seal in. The Hydrating Face Cream supports the barrier by slowing how quickly water escapes, and that single change does more for reactive skin than most treatment products.
SPF in the morning, because UV exposure worsens a barrier that is already struggling. Mineral filters tend to sit better on reactive skin than chemical ones, though this varies from man to man.
Nothing else. No acids, no retinoids, no clay masks, no exfoliating cloth. Boring, and it works.
Reintroducing anything stronger
Once your skin has settled, bring things back one at a time — never two. Patch test on the jaw or behind the ear for a few days before it goes anywhere near your whole face.
Two further habits help. Apply actives to dry skin rather than damp, since damp skin absorbs more and reacts harder. And drop the frequency: twice a week is a reasonable starting point for anything with an acid or a retinoid in it, and you can build from there if nothing objects.
If something stings on application every single time, that is not the product working. That is the product being wrong for you.
Where care ends
Sensitivity that responds to a simplified routine is a barrier problem. Persistent redness, a rash, scaling, itching, or anything that keeps returning regardless of what you use is a different category of thing, and no cosmetic routine is the answer to it. If it persists or worsens, see your GP or a dermatologist.