Do Pores Open and Close with Hot and Cold Water?

What a pore actually is

When people say “pore”, they usually mean the surface opening of a hair follicle connected to a sebaceous, or oil, gland.

The top section of the follicle, running from the skin surface down to where the oil gland’s duct joins it, is called the infundibulum. This is the funnel you see as a pore, and sebum travels through it to reach the skin surface.

A small muscle attached to the follicle can make the hair stand up, producing goosebumps. That does not give the pore a door that opens with heat and closes with cold. The opening can become stretched or look more noticeable, but a change in its appearance is different from opening or shutting it.

Why the myth feels true

Warm water or a hot towel can leave skin soft, flushed and warmer to the touch. A cold splash feels cool and may leave the surface feeling firmer for a while. Those sensations make the idea of opening and closing pores easy to believe.

Temperature affects blood flow, the behaviour of skin oils and how the surrounding skin feels. None of that means the pore has a temperature-controlled lid. Nor does it mean its size can never change: oil, congestion and changes in the surrounding skin can affect how large it looks.

What hot water does

Sebum is a mixture of substances, rather than a single clean oil. Laboratory studies of sebum models show that its components soften at different temperatures. Warmth can change the consistency of surface oils, but that is not proof that hotter water gives you a better cleanse.

Heat also increases blood flow near the surface, so skin may look redder and feel warmer. For people whose rosacea or eczema is triggered by heat, that can make a hot wash especially uncomfortable.

Hot water can stress the barrier too. A 2022 Journal of Clinical Medicine study of 50 healthy volunteers found increased transepidermal water loss, or TEWL, after hot-water exposure. TEWL measures water escaping through the skin and is one way researchers assess barrier function.

The authors concluded that long, continuous water exposure can impair barrier function, with hot water more harmful in their experiment. The study concerned hand exposure, not an ordinary facial wash, so it supports caution about heat and prolonged exposure rather than setting an exact temperature for your face.

What cold water does

Cold can constrict superficial blood vessels and temporarily change how skin looks or feels. A cool, firm feeling does not mean pores have been sealed, and it is not evidence of a lasting reduction in their size.

A cold-water wash is not automatically an ineffective wash. The cleanser, what you are removing, your technique and a thorough rinse all matter. Oil and water do not mix readily at either temperature; the cleansing formula helps lift oily residue.

In the same 2022 study, prolonged cold-water immersion also increased TEWL, although less than hot-water immersion. That does not establish that a brief cool rinse damages facial skin. A cool splash is optional if you find it comfortable. It is not a pore-closing step.

What decides how big pores look

A study of 60 volunteers published in the British Journal of Dermatology in 2006 found associations between pore size and sebum output, sex and age. It also found larger measured pores around ovulation in its female participants. This suggests hormones can play a part, but it does not predict what every person’s skin will do across a menstrual cycle.

A dermatoscopic study of 2,585 women across several countries, published by Flament and colleagues in 2015, found substantial differences in pore size and density between the populations studied. In most groups, the measurements levelled off with age. The authors also raised the possibility that visible pores reflect changes associated with sun exposure; their study did not establish one cause for everyone.

Pore appearance has several contributors. Sebum, congestion, genetics and the firmness of the surrounding skin can all matter. Sun damage can make pores more noticeable as skin loses firmness.

What sits inside the pore matters too. A buildup of oil and dead skin cells can stretch the opening and make it look darker or larger. Reducing congestion can make pores less noticeable. That is different from closing them with cold water.

What helps pores look less noticeable

A 2023 review in the Journal of Cosmetic Dermatology examined 19 clinical trials of treatments for visible facial pores. The approaches included topical treatments, chemical peels and procedures. Several improved measurements of visible pore area or count, with results depending on the treatment and study.

These are changes in visible pores and their measured appearance, not evidence that a treatment removes the skin’s normal openings. The review is not a reason to start several treatments at once.

For everyday care:

1. Cleanse gently and consistently. Remove daily buildup without scrubbing or chasing a squeaky feeling. If your face feels tight afterwards, look at the wash itself.
2. Consider the cause of congestion. A salicylic-acid product may help some people with clogged pores, but irritation and individual tolerance still matter. One ingredient name does not tell you how every finished product will perform.
3. Get advice on treatment when needed. A dermatologist can advise whether a retinoid or another treatment is appropriate for your skin.
4. Protect against sun damage. Use broad-spectrum SPF 30 or higher and avoid rubbing or picking, which can irritate skin and make pores more noticeable.

Be wary of a promise to close pores permanently. A toner or astringent can leave skin feeling tight without delivering the structural change that phrase suggests.

The best water temperature for your face

Lukewarm. Choose water that feels comfortably warm rather than hot. You do not need a thermometer or a hot-to-cold sequence to wash your face well.

• Keep the wash gentle and your face out of the stream of a hot shower.
• Skip steam intended to “open pores”, especially if heat triggers redness or discomfort.
• Rinse the cleanser away thoroughly. A cool final splash is optional, not necessary.
• Pat dry instead of rubbing, then apply moisturiser while skin is still slightly damp.

Frequently asked questions

Do pores open with steam?

No. Steam warms the skin and may soften surface oils, but it does not open a door in the pore. It can also irritate skin that reacts to heat.

Can you permanently shrink pores?

A water rinse cannot permanently shrink or close pores. Skincare and professional treatments may make them less noticeable by addressing congestion, oiliness or changes in surrounding skin. The extent and duration of any improvement vary.

Why do my pores look bigger on some days?

Oiliness, congestion, irritation and temporary changes in the surrounding skin can affect their visibility. Hormonal changes may contribute too. This is different from pores opening and closing on command.

Is a hot towel before shaving useless?

No. A comfortably warm towel can soften facial hair and make shaving easier. It does not need to be hot, and it does not open pores.

The Velnaura take

Great skin isn’t luck, it’s a ritual. For pores, that means a gentle lukewarm wash, moisturiser as needed and daily sun protection, kept up consistently. You do not need to shock your skin with temperature changes to care for it.

Skin begins with genetics. Where you take it is something more.

This article is educational and does not replace personal medical advice. If you have persistent acne, rosacea, eczema or skin that is sore or reactive, see a qualified dermatologist.