In short

Spots on the back and chest are usually acne: the same hormonal breakouts she gets on her face, driven by puberty hormones and busy oil glands. 

Spots on the bum are more often folliculitis (inflamed hair follicles) or keratosis pilaris ("strawberry skin"), not true acne.

Most cases settle with gentle washing, benzoyl peroxide and loose, breathable clothing.

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Why does my daughter get spots on her back and chest?

If she's covering up at the pool or getting upset about her back before a night out, it's worth knowing this is incredibly common and rarely stays on the face.

Spots on the back and chest are almost always acne, the exact same condition she gets on her face. 

During the stages of puberty, hormones tell her oil glands to produce more sebum (the skin's natural oil). 

That oil, along with dead skin cells, blocks hair follicles, and a normal skin bacterium tips some of them into red, inflamed spots.

Her back and chest have some of the largest oil glands on the body, so they're a natural target.

More than half of people with acne get it on their back, and around 1 in 7 get it on their chest, according to the NHS.

A few things worth knowing:

• Acne runs in families, so if you or her other parent had body acne as a teen, she's more likely to as well
• It's most common in girls aged 14 to 17, and usually eases in the mid-twenties
• Sweat, heat and friction from tight clothes, straps and sports kit can make it flare, though they don't cause it
• Poor hygiene does not cause acne, so this isn't about her not washing enough

Because the driver is hormonal, body acne and facial acne often go hand in hand. 

If you want the fuller picture on what's happening beneath the skin, luna’s guide to your daughter's hormonal acne and what helps breaks it down.

Why does my daughter get spots on her bum?

Spots on the bum often aren't acne at all. The skin there behaves differently, so bumps and spots are usually one of three other things.

The three most common causes are:

• Folliculitis: inflamed hair follicles that show up as small, tender red spots, sometimes with a tiny white head. It's very common on the buttocks and is triggered by friction, sweat, tight clothing and sitting for long stretches
• Keratosis pilaris: a harmless build-up of keratin that blocks follicles, leaving small rough bumps often nicknamed "strawberry skin" or "chicken skin". It's common on the bum, thighs and upper arms, tends to run in families and is often worse in winter
• Ingrown hairs: these appear after shaving or waxing, when a hair curls back into the skin and leaves an itchy, raised bump

Telling them apart matters, because the fixes are different. 

If her spots flared after she started removing hair, ingrown hairs are worth ruling out first, and luna's guide on when your daughter should start shaving covers gentler ways to do it.

If she's asking questions about her own skin, luna gives teen girls a space to explore skin and body topics at their own pace, with content reviewed by medical experts rather than driven by influencers or ads.

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What actually helps clear my daughter's body spots?

Most body spots respond to the same simple hygiene routine, whether they're acne, folliculitis or keratosis pilaris. 

The aim is less friction, less trapped sweat, and gentle care rather than harsh scrubbing.

Things that tend to help:

• Showering soon after she sweats, including after PE or sport, to rinse away oil and bacteria
• Swapping tight tops and leggings for looser, breathable cotton or sweat-wicking fabrics, and washing kit between wears
• Using a wash or gel containing benzoyl peroxide, which reduces the bacteria involved in acne (it can bleach fabric, so a white towel and old bedding help)
• Going gentle, as scrubbing, loofahs and harsh exfoliants tend to make spots angrier rather than better
• Moisturising regularly as a part of a teen skincare routine, which is especially helpful for keratosis pilaris
• Leaving spots alone rather than squeezing them, which lowers the risk of scarring and dark marks

One thing that comes up a lot with parents is whether food is to blame. 

The honest answer is that the evidence is limited and mixed, which luna unpacks in whether your daughter's diet can affect her acne.

Give any new routine a fair run. Most treatments need around six weeks before you'll see a real difference.

When should I take my daughter to see a doctor about her body acne?

It's worth booking an appointment if her acne is leaving scars, if it is deep and painful, or if over-the-counter treatments haven't helped after about six to eight weeks.

You might also want to get it checked if she has recurring painful lumps in areas like the buttocks or groin, as these can occasionally point to something that needs different treatment.

A doctor has options that aren't available over the counter. 

Depending on what's going on, they might suggest a stronger prescription cream, a course of antibiotics, or for some older girls the combined contraceptive pill, which can help with hormonal acne. 

These take time to work, often two to three months, so patience is part of the plan. 

luna’s guide on when your daughter should see a doctor about acne walks through what to expect.

FAQs

How do I know if it's acne or something else?

As a rough guide, spots on the back and chest are usually acne, while bum spots are more often folliculitis or keratosis pilaris. 

If you're unsure, or the spots are painful or spreading, a doctor or pharmacist can tell them apart and point you to the right treatment.

Does keratosis pilaris ("strawberry skin") go away?

It's harmless and often improves with age, though many people have it for years. 

Regular moisturising and gentle exfoliation can soften the bumps, but there's no need to treat it unless it's bothering her.

Can her diet be causing her body acne?

The evidence linking specific foods to acne is limited and far from settled, so cutting out food groups isn't recommended. 

A balanced diet supports her skin and overall health, which matters more than chasing any single trigger.

Will body acne leave scars?

It can, especially if spots are picked or squeezed, or if deeper cystic spots go untreated.

The best protection is treating it early and keeping hands off, and a doctor can help if scarring is a worry.

Body spots are one of those things that can knock a teenager's confidence hard, even when they're completely normal and treatable. 

A calm word that this is common, plus a simple routine she can own herself, usually does more good than a big intervention.

If her skin is starting to affect how she feels about herself, what to do when your daughter's acne is affecting her confidence offers some gentle ways in. 

And luna gives her a private, judgement-free place to learn about her changing skin and body, with everything reviewed by medical experts.

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