Psoriasis on the Back and Buttocks: Causes and Care

October 24, 2026

Psoriasis on the back and buttocks is common, and it often looks different in each place. On the back it usually shows up as thick, scaly plaques. Between and under the buttocks the skin stays moist, so patches tend to be smooth, shiny and red or dark, with little scale. Gentle cleansing, a regular moisturizer, loose cotton clothing and treatment matched to the area by your doctor can help keep both under control.

If you are still working out your everyday routine, our guide to choosing a psoriasis cream for daily use in India is a good place to start.

Key takeaways

The back usually gets classic plaque psoriasis. The buttock crease often gets inverse (flexural) psoriasis, which is smooth rather than scaly.
Sweat, rubbing, tight clothes and long hours of sitting can all irritate these areas, especially in Indian heat and humidity.
Skin folds need milder treatment. Strong steroid creams can thin the skin there, so use only what your doctor prescribed for that area.
Folds can also pick up yeast or fungal infections, which can look like psoriasis. A dermatologist can tell them apart.
Psoriasis in the buttock crease has been linked to a higher chance of psoriatic arthritis, so mention joint pain to your doctor.

What psoriasis looks like on the back and buttocks

On the back

The back, especially the lower back, is a common place for plaque psoriasis. Plaques are raised and well defined. On fair skin they look red with silvery-white scale. On brown and darker Indian skin they can look purple, grey or dark brown, and they may leave dark marks after they settle.

On the buttocks and in the crease

Psoriasis can affect the buttocks, the fold between them (the gluteal or natal cleft) and the skin around the anus. The National Psoriasis Foundation notes that both plaque psoriasis and inverse psoriasis can appear here. Inverse psoriasis in skin folds usually has little scale because the area stays moist. It tends to look smooth, shiny and red, or darker than the surrounding skin. DermNet notes that a painful crack (fissure) can form deep in the crease.

These patches can itch, sting and split. Our guide to inverse psoriasis in skin folds goes into more detail.

Why these areas flare

Psoriasis is an immune-driven condition. Indian hospital-based studies suggest it affects roughly 0.44–2.8% of people, and men are affected about twice as often as women. Skin cells build up much faster than normal, in a few days instead of about a month. Doctors do not fully understand why it chooses particular spots, but some everyday factors make the back and buttocks more likely to flare:

Sweat and heat. Sweat trapped in folds or under a backpack strap irritates inflamed skin. In humid cities like Mumbai, Chennai or Kolkata, the buttock crease may never fully dry during the day.
Friction. Tight jeans, synthetic underwear, belts, bra straps and rubbing against a chair back all add pressure. Skin injury, even small and repeated, is a known psoriasis trigger.
Long hours sitting. Office work, two-wheeler commutes and long train or bus journeys keep the buttocks warm, damp and under pressure.
General triggers. Stress, infections, smoking, alcohol, some medicines and weather changes can set off flares anywhere, including here.

Could it be something else?

A red, itchy rash on the back or between the buttocks is not always psoriasis. Getting the diagnosis right matters, because the wrong cream can make things worse.

Fungal infection (tinea, "daad"). Very common in hot, humid weather. It often has a raised, spreading edge and may clear in the middle.
Yeast (Candida) infection. Skin folds are prone to yeast and fungal infections. These can occur on their own or on top of psoriasis.
Seborrheic dermatitis. It can appear in folds as thinner, salmon-pink patches. DermNet notes it can be hard to tell apart from flexural psoriasis, and the two can occur together.

Be careful with over-the-counter "combination" creams that mix a strong steroid with an antifungal and an antibiotic. They are widely sold in Indian pharmacies and may calm a rash for a while, but they can hide the real problem and thin the skin. Ask a dermatologist before using any steroid cream on your buttocks or in the crease.

Medical treatment: what doctors usually consider

Treatment depends on how much skin is involved and where it is. The thick plaques on the back often tolerate stronger topical treatment. The thin, moist skin of the buttock crease needs a gentler approach.

For skin folds, a 2009 paper from the National Psoriasis Foundation Medical Board recommended low- to mid-potency topical steroids as first-line, short-term treatment, typically for 2–4 weeks. For longer-term care it favoured steroid-free options such as calcipotriol (a vitamin D cream), tacrolimus or pimecrolimus, which do not thin the skin.
DermNet adds that stronger steroids should be used with care in folds and only for a few days. Products such as coal tar, salicylic acid and dithranol are often too irritating for this skin unless your doctor dilutes them or advises short contact.
For widespread back psoriasis, or when psoriasis affects several areas, your doctor may suggest phototherapy, oral medicines or biologics. Phototherapy reaches the back well but works poorly in hidden folds.

The American Academy of Dermatology advises using only the treatment your dermatologist prescribed for sensitive areas, not a cream meant for elbows or knees. If you are already on a prescribed treatment, keep taking it. Talk to your doctor before stopping or changing anything.

Daily care for the back and buttocks

Bathing

Bathe once a day with warm, not hot, water. The AAD suggests about 5 minutes for a shower and 15 minutes or less for a bath.
Wash with your hands, not a loofah or scrub. Rinse soap out of the crease completely.
Pat dry gently. Make sure the buttock fold is dry before you dress.
Use a mild cleanser. Deodorant and antibacterial soaps can be harsh on this skin. Xpsoria Body Wash is a sulfate-free option made with aloe vera, glycerin, olive oil infused with bitter gourd peel, and mild coconut-derived cleansers. It also contains sandalwood, cedarwood and eucalyptus essential oils, so patch-test it first and keep it away from cracked skin in the crease.

Moisturizing and reaching your back

Moisturize within five minutes of bathing, while the skin is slightly damp.
For the back, a long-handled lotion applicator, or a family member's help, makes it easier to cover patches you cannot see.
Thicker creams suit back plaques. In the buttock crease, a light layer is usually better than a heavy one, and the area should not be covered or sealed unless your doctor advises it.
You can browse steroid-free products for these areas in our psoriasis on body collection. Before using any herbal product on a new area, patch-test it for a few days.

Clothing, sitting and the toilet

Wear loose cotton underwear and breathable clothes. Our guide to the best fabrics for body psoriasis explains why.
If you sit for long hours, stand up and move every hour or so. A cotton cover on the chair or bike seat can reduce sweat.
Use soft toilet paper or wash gently with water and pat dry. A fibre-rich diet with dal, vegetables, fruit and whole grains makes bowel movements easier on sore skin.

Safety notes on herbal products

Babchi (bakuchi) contains compounds that make skin more sensitive to sunlight. Avoid sun on areas where you apply babchi-containing products, and be careful on the back if you sunbathe or work outdoors.
Giloy taken by mouth has been linked to liver injury in reports from Indian hospitals. Do not take it without a doctor's advice, especially if you already take methotrexate or other medicines that affect the liver.
During pregnancy and breastfeeding, and for children, check with a doctor before using any herbal oil or cream.

A note on joints

A long-term study from Minnesota, USA, found that people with psoriasis in the buttock crease or around the anus had more than twice the risk of later developing psoriatic arthritis compared with those without psoriasis there. Scalp and nail psoriasis were also linked to it. This does not mean you will get arthritis. It does mean you should tell your doctor about morning stiffness, swollen fingers or toes, heel pain or low back pain that eases with movement. Read more in our guide to psoriatic arthritis signs and when to see a rheumatologist.

When to see a doctor

See a dermatologist, at a government hospital skin OPD or a private clinic, if you notice any of these:

A rash in the buttock crease or around the anus that you have never had diagnosed.
Painful cracks that bleed, ooze, or make sitting or passing stool hard.
Pus, yellow crusts, a bad smell, spreading redness or warmth, which can be signs of infection.
Fever or chills along with a flare.
Patches that spread quickly or cover large parts of your back and body.
Red, inflamed skin over most of the body, or small pus-filled bumps. These need urgent medical care.
Joint pain, swelling or stiffness.

Frequently asked questions

Why is psoriasis between my buttocks not scaly?

The skin in the fold stays warm and moist, so scale does not build up the way it does on the elbows or back. Inverse psoriasis there usually looks smooth, shiny and red or dark.

Can I use the same steroid cream on my back and my buttocks?

Not without asking your doctor. Skin folds absorb steroids more easily and thin more readily, so doctors usually choose milder or steroid-free options there.

Does sitting all day make buttock psoriasis worse?

It can. Heat, sweat and pressure from long hours of sitting irritate the area. Short breaks, cotton clothing and keeping the fold dry may help.

How can I apply cream to psoriasis on my back by myself?

Try a long-handled lotion applicator or a back-applicator pad, or ask a family member. Applying cream after a bath, while the skin is slightly damp, helps it spread more easily.

Sources

This article is for general information and is not medical advice. Please consult a qualified dermatologist or Ayurvedic doctor for diagnosis and treatment.

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