At most two or three times a week, and never every day, says a Harvard dermatologist; the American Academy of Dermatology gives no number at all, only a rule: the harsher the scrub, the less often. No study has tested any of these frequencies. Here is who says what and why they differ, how to adjust for dry, oily or bumpy skin, the signs you are overdoing it, when not to scrub at all, and what a coffee scrub does and does not do.
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How often should you exfoliate your body? Two or three times a week at most is the most common expert answer, and once a week or less if your skin is dry or sensitive. But no study has tested any of these numbers. The American Academy of Dermatology does not give one at all, only a rule: the harsher the method, the less often you need it. We are Nghê Prana, a riverside hotel and spa on the Thu Bồn at Cẩm Nam in Hội An, and we sell three body scrubs. This page sets out who recommends what and why the numbers differ, when not to exfoliate, and what a coffee scrub does and does not do.
| Source | How often | For what |
|---|---|---|
| American Academy of Dermatology | No number: "the more aggressive the exfoliation, the less often" | Any skin, any method |
| Harvard Health (dermatologist Rachel Reynolds) | "At most" two or three times a week; never every day | Face and body |
| Cleveland Clinic (an aesthetician) | Face once or twice a week; body two or three times | Face against body |
| Healthline (two dermatologists) | One or two times a week; three or four for dry, flaky skin | Coffee scrubs |
| Vinmec (Hanoi) | Two or three times a week; once for dry or sensitive skin | Body |
| Hello Bacsi (reviewed by a doctor) | Once or twice a week for normal skin | Body |
The AAD page, updated 6 February 2026, says only that "the more aggressive the exfoliation, the less often it needs to be done". Harvard Health (20 May 2024) quotes Rachel Reynolds, interim chair of dermatology at Beth Israel Deaconess: "At most, do it two or three times a week. Your skin needs to repair itself in between exfoliation episodes." The Cleveland Clinic page, dated 23 October 2026, quotes an aesthetician, not a doctor: face once or twice a week, the body two or three times, because "your body can handle more exfoliation than the skin on your face". In Vietnamese, Vinmec gives "2-3 lần/ tuần" (two to three times a week) and once a week for dry or sensitive skin, and Hello Bacsi, reviewed by ThS BS CKI Lạc Thị Kim Ngân, gives "1-2 lần mỗi tuần" (once or twice a week) and repeats the AAD rule. On a Healthline page about coffee scrubs, one dermatologist says once or twice a week and another three or four times for dry, flaky skin.
They differ because they answer different questions: face or body, a grainy scrub or an acid lotion, oily skin or dry, a soft washcloth or a stiff brush. Each is a reasonable opinion; none comes from a trial. We searched Europe PMC for any study comparing how often people scrub their body and found none. What has been measured is how fast the skin renews itself: the outer layer takes about 20 days to replace itself in young adults and more than 10 days longer in older adults (Grove and Kligman, 1983), and the whole epidermis about 39 days (Weinstein and colleagues, 1984). The "every 28 days" you may have read is not a measurement in any source we found. And exfoliating is optional: "Nothing happens if you don't exfoliate," says Reynolds; "you just walk around with bumpy or slightly dry skin".
The one real disagreement is over bumpy skin. The AAD's self-care page says to "avoid scrubbing your skin", the Mayo Clinic that "vigorous scrubbing" may make it worse, and the NHS "do not use harsh scrubs". Harvard's Reynolds, by contrast, calls physical exfoliators "a good first choice" because the skin there is tougher. They agree more than it sounds: all of them allow a gentle loofah, mitt or washcloth; the split is over grit and force. For back acne there is no split: the AAD says "abrasive scrubs can worsen acne. Ditto for loofahs, back brushes, and buff puffs." Its self-tan page does recommend a washcloth before you apply it.
The AAD names skin "that is red and irritated"; the Cleveland Clinic adds "cracked skin"; Harvard describes irritant dermatitis that looks "red, angry, and chapped", and warns that exfoliating "can make you more prone to sunburn". A dermatologist quoted by Healthline adds peeling and skin that feels "uncomfortable and tight". Years of hard rubbing can leave something slower: brown patches over the collarbones, shoulder blades and spine, called friction melanosis, described in 23 patients in Japan who used nylon towels or brushes (Hidano, 1984), 24 in Italy (Siragusa, 2001) and 13 in Jordan who used loofahs (Al-Aboosi, 2004). In a 2026 Japanese study of 79 patients with skin disease, itch scores fell from 4.89 to 1.90 out of 10 among those who stopped using a washcloth (Miyazawa and colleagues); it looked back at records rather than testing it, but it points the same way. Our reading: if any of these sound familiar, stop for a week or two and moisturise.
The tool matters as much as the timetable. In laboratory tests, wet loofahs grew Pseudomonas, Klebsiella, Enterococcus and other bacteria, helped along by the dead skin caught in the fibres (Bottone and colleagues, 1994); an earlier report traced one patient's skin infection to their own loofah (Bottone and Perez, 1993). The authors advised letting it dry after use and disinfecting it regularly. Our reading: hang the loofah or mitt somewhere it dries, replace it when it stays damp or smells, and keep it off broken skin. The AAD's home technique is gentle, small circles for "about 30 seconds", rinsed with lukewarm, not hot, water, then moisturiser straight away.
In Hội An the first line matters most. After a day at An Bàng beach, a scrub is the treatment that has to wait: book it once the redness and tenderness have gone, or have a gentle massage instead; our page on massage with a sunburn explains which treatments are fine on sun-sore skin.
Planning a trip around this? See dates at our quiet riverside hotel on the Thu Bồn. Check availability →
| Claim | What the studies found | Verdict |
|---|---|---|
| Smoother skin | Any scrub removes dead cells from the surface | True; that is what a scrub is for |
| Less cellulite | Tested only as caffeine creams left on twice a day for 6 to 12 weeks; placebo improved too | Not shown for a scrub |
| Better circulation | The one study that measured skin blood flow under caffeine found no change | Not shown |
| Antioxidant, anti-ageing | Laboratory and animal data; a 2026 review calls it insufficient | Not shown |
| Gentle and natural | Grounds are jagged; one study found some coffee scrubs briefly disrupted the skin barrier | Firm, not gentle |
The most recent placebo-controlled cellulite trial gave a 2% caffeine cream twice a day for 12 weeks: scores fell from 3.96 to 2.50 on caffeine, and from 3.88 to 2.83 on the placebo cream (Ponto and colleagues, 2026). A leave-on cream used 168 times is not a scrub rinsed off after a few minutes. When Lupi and colleagues measured skin blood flow under a caffeine solution in 2007, the measures "did not change significantly". The only study of spent coffee grounds as an exfoliant on people found that two of the formulas disrupted the skin barrier for a while, with "full recovery" within 6 hours of hand cream (Elezović and colleagues, 2025), and a 2026 review concluded the evidence is "insufficient to recommend coffee-derived products" for skin treatment (Liao and colleagues). A Guardian writer who tested a coffee scrub on the face found the skin "smoother but it also felt super dry", and advised keeping it for "the thicker skin on your body". One dermatologist on Healthline adds that "some people develop allergic dermatitis from coffee grounds". What a coffee scrub does reliably is what every scrub does: it leaves skin smooth, and it smells good.
Our reading of the AAD rule: a full-body scrub with a therapist's hands for most of an hour is the stronger end of mechanical exfoliation, far more than 30 seconds a patch in the shower. So treat it as your exfoliation for the week, not as one more on top. Skip your own scrub for a few days before and after, moisturise afterwards, and do not book one the day after a burn at the beach. We have not measured our scrubs' effect on the skin barrier, and no one has measured anyone else's.
| Scrub | Grit | Price, 60 min |
|---|---|---|
| Sea salt with yogurt or milk | Softens as it is worked; the gentlest | 550,000₫ |
| Coffee grounds and green tea | Vietnamese robusta; the firmest | 650,000₫ |
| Mineral mud | Fine; leaves the smoothest finish | 650,000₫ |
Prices per person, read from our live spa menu on 24 October 2026; at the 26,000₫ rate we use across the site, the salt scrub is about US$21 and the other two about US$25. Choose the salt scrub for a first scrub or drier skin, and the coffee if your skin is oily and you want the firmest grit; we make no claim about caffeine doing anything to cellulite or circulation. The body scrub page has what each is made of and where the mud comes from, and the spa packages put a scrub together with a massage and a facial.
No trial has compared exfoliating once, twice or three times a week, on the body or the face, so every number on this page, including ours, is an opinion. No study has tested a coffee-ground body scrub for cellulite, circulation or ageing. The friction-darkening studies are small case series of people who rubbed hard for years, not of weekly scrubs. We are a hotel spa, not a dermatologist: for a rash, bumps that do not settle, or skin that darkens after scrubbing, see one.
Nghê Prana Riverside Hotel & Spa, Hẻm 384 Nguyễn Tri Phương, Cẩm Nam, Hội An, on the Thu Bồn, 3.2 km from the Old Town. The spa is open from 9:00 to 21:00 every day and takes visitors as well as hotel guests. Book on the online form or by phone or WhatsApp on +84 896 687 961; an hour's notice is enough, and walk-ins are welcome when the room is free. Tell us at the consultation about sunburn, eczema, acne or retinoid creams. Coming as two? Scrubs side by side fit in the private room on the couple spa page.
Sources: American Academy of Dermatology, How to safely exfoliate at home (updated 6 February 2026), Keratosis pilaris: self-care, Back acne, How to apply self-tanner; Harvard Health, 20 May 2024; Cleveland Clinic, 23 October 2026; Mayo Clinic, 23 October 2024; NHS, 4 July 2024; Healthline, 29 September and 11 August 2021; The Guardian, 5 November 2021; Vinmec, 9 July 2024; Hello Bacsi, 7 December 2022; Grove GL and Kligman AM, Journal of Gerontology 38(2), 1983; Weinstein GD et al., Journal of Investigative Dermatology 82(6), 1984; Hidano A et al., Annales de Dermatologie et de Vénéréologie 111(12), 1984; Siragusa M et al., European Journal of Dermatology 11(6), 2001; Al-Aboosi M et al., International Journal of Dermatology 43(4), 2004; Miyazawa H et al., Journal of Dermatology 53(5), 2026; Bottone EJ et al., Journal of Clinical Microbiology 31(3), 1993 and 32(2), 1994; Ponto T et al., Pharmaceutics 18(2), 2026; Lupi O et al., Journal of Cosmetic Dermatology 6(2), 2007; Elezović A et al., Journal of Cosmetic Dermatology 24(12), 2025; Liao HF et al., Antioxidants 15(2), 2026. All read 24 October 2026; prices from the Nghê Prana spa menu the same day.
23 rooms on the quiet south bank of the Thu Bồn River, ten minutes by bicycle from the Ancient Town and a world from its noise.
Book your stayTwo or three times a week at most for normal or oily skin, and once a week or less for dry or sensitive skin, according to Harvard Health and the Cleveland Clinic. The American Academy of Dermatology gives no number, only a rule: the more aggressive the exfoliation, the less often. No study has tested any of these frequencies.
For most skin, yes. Harvard's Rachel Reynolds says "Don't exfoliate every day" because skin needs to repair itself in between. The exception the AAD allows is gentle daily use of a loofah or washcloth as part of a plan for keratosis pilaris, without hard scrubbing.
Skin that is red, irritated, peeling, cracked or tight (AAD; Cleveland Clinic; Healthline), and easier sunburn (Harvard). Years of hard rubbing with nylon towels or loofahs can also leave brown patches over the bones, called friction melanosis.
On sunburn or open cuts, on back or chest acne, on eczema or psoriasis in a flare, and with care if you use retinoid, retinol or benzoyl peroxide products (AAD; NHS). Darker skin tones should exfoliate gently, because aggressive exfoliation can leave dark spots.
Not shown. The caffeine trials used creams left on twice a day for 6 to 12 weeks, and in the latest one the placebo improved too (Ponto 2026: 3.96 to 2.50 against 3.88 to 2.83). The one study that measured skin blood flow under caffeine found no change (Lupi 2007). A coffee scrub smooths skin like any scrub.
Sea salt with yogurt or milk 550,000₫, coffee grounds and green tea 650,000₫, mineral mud 650,000₫, each 60 minutes per person (menu read 24 October 2026). Skip them on sunburned or broken skin.
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