Jock Itch (Tinea Cruris): Causes, Treatment and How to Tell It From Eczema
Fungal skin guide
Jock itch (tinea cruris) is a fungal infection of the skin in the groin, inner thighs and buttock crease. It causes an itchy, red or brown rash with a raised, scaly edge that slowly spreads outward. It is caused by the same fungi as athlete's foot and ringworm and is treated with an antifungal cream, usually for 2 to 4 weeks. Steroid creams on their own can make it worse, so it matters to tell it apart from eczema before treating it.
- Cause: dermatophyte fungi, most often Trichophyton rubrum, which thrive in warm, sweaty skin folds.
- Look for: an itchy, ring-like rash with a sharp, scaly border that spreads down the inner thigh. The scrotum is usually spared.
- First-line treatment: an antifungal cream such as terbinafine, clotrimazole or miconazole, continued 1 to 2 weeks after the rash clears.
- Avoid steroid-only creams: they can hide the fungus and let it spread ("tinea incognito").
- Stop it coming back: treat athlete's foot too, keep the groin dry, and put socks on before underwear.
What is jock itch?
Jock itch, or tinea cruris, is a superficial fungal infection of the groin. It belongs to the same family of infections as ringworm (tinea corporis) and athlete's foot (tinea pedis). Despite the name, it is not limited to athletes or to men: anyone who sweats, wears tight clothing or has skin folds can get it. It is contagious through skin contact and shared towels, and it often spreads from a person's own feet.
What does jock itch look like?
- A red, pink or brown patch in the crease between the thigh and groin, often on both sides
- A sharp, raised, scaly border that spreads outward, with a clearer or browner centre
- Itching or burning, often worse after exercise or sweating
- Spread down the inner thighs and towards the buttocks; the scrotum and penis are usually not involved
On darker skin the rash may look brown, grey or purple rather than red. If the scrotum is red and sore, or there are small separate spots around the main rash, a yeast (Candida) infection is more likely.
What causes jock itch?
Dermatophyte fungi live on the outer layer of skin and feed on keratin. They grow best in warm, damp, airless places, which is why the groin is a common site (Caplan et al., 2025). Risk factors include:
- Heavy sweating, hot and humid weather, and sports
- Tight or synthetic underwear and staying in sweaty clothes
- Athlete's foot, which can be carried to the groin on hands or underwear
- Higher body weight, diabetes and a weakened immune system
- Sharing towels or living in close contact with someone who has tinea
Is it jock itch, eczema or something else?
Several rashes look alike in the groin. Getting it right matters, because antifungals do not help eczema and steroid creams can make fungal rashes worse.
| Condition | Typical look | Clues |
|---|---|---|
| Jock itch (tinea cruris) | Spreading patch with a raised, scaly edge and clearer centre | Spares the scrotum; often athlete's foot too; spreads slowly outward |
| Eczema or contact dermatitis | Dry, rough or weepy patches without a sharp, scaly border | History of eczema elsewhere, or a new soap, wipe or detergent |
| Intertrigo | Raw, red, moist skin exactly where two skin surfaces touch | Friction and moisture; may become infected with yeast or bacteria (Kalra et al., 2014) |
| Candida (yeast) | Bright red, shiny skin with small satellite spots | Often involves the scrotum; common with diabetes or antibiotics |
| Inverse psoriasis | Smooth, well-defined, shiny red plaques with little scale | Psoriasis elsewhere, such as the scalp, nails or navel |
A doctor can confirm jock itch quickly by scraping a little scale and looking for fungus under the microscope (a KOH test) (Caplan et al., 2025). See also contact dermatitis, intertrigo and inverse psoriasis.
How do you get rid of jock itch?
- Use an antifungal cream once or twice a day on the rash and 2 to 3 cm beyond its edge. A Cochrane review found that topical antifungals, including terbinafine and azoles such as clotrimazole and miconazole, are effective for tinea cruris and tinea corporis (El-Gohary et al., 2014).
- Keep going after it clears. Most rashes improve within 2 weeks, but continue for 1 to 2 weeks after the skin looks normal, usually 2 to 4 weeks in total, to stop it returning.
- Treat athlete's foot at the same time if you have it, or the groin will keep being reinfected.
- See a doctor if it does not improve in 2 weeks, keeps coming back or is spreading widely. Tablets may be needed, and doctors now report fungal strains, including Trichophyton indotineae, that respond poorly to standard treatment (Caplan et al., 2025).
Why can steroid creams make jock itch worse?
Steroid creams calm inflammation, so the redness and itch fade at first, but they also weaken the skin's local defence against fungus. The infection can then spread and change its appearance, which doctors call "tinea incognito". Combination creams that mix a steroid with an antifungal are widely sold, but reviews do not recommend them as routine first-line treatment for tinea (El-Gohary et al., 2014; Caplan et al., 2025). If you are not sure whether a groin rash is fungal, avoid steroid creams until it has been checked. Read more in QICAOGANGMU vs steroid creams.
How can you soothe the itch while the antifungal works?
- Keep the area cool and dry: shower after exercise, pat dry and let the skin air before dressing.
- Wear loose cotton underwear and change it daily, or more often if you sweat.
- Do not scratch; scratching can spread fungus to other areas and break the skin.
- Use a cooling, steroid-free cream on the inner thigh and groin crease (not on the genitals). Borneol and menthol act on the skin's cold receptors to ease itch (Tian et al., 2023).
Some traditional herbs have been studied against the same fungi. She Chuang Zi (Cnidium monnieri) extract and its compound osthole inhibited Trichophyton rubrum and other fungi in laboratory studies (Yanyun et al., 2021; Li et al., 2018). These are lab results, not proof that a cream cures jock itch, so use a proven antifungal as the main treatment. Learn more about She Chuang Zi research.
How do you stop jock itch coming back?
- Socks before underwear: this stops fungus from your feet being carried up to the groin.
- Dry thoroughly after washing, including skin folds, and use a separate towel for your feet.
- Wash gym clothes, underwear and towels after each use, at 60°C if the fabric allows.
- Change out of sweaty clothes soon after exercise.
- Do not share towels and treat everyone in the household who has tinea.
When should you see a doctor about jock itch?
- No improvement after 2 weeks of an antifungal cream, or it keeps returning
- The rash is spreading widely, to the buttocks, waist or other areas
- Pain, pus, fever, broken skin or a rash on the genitals themselves
- You have diabetes or a weakened immune system
- You are not sure it is fungal
QICAOGANGMU: steroid-free, cooling itch relief
QICAOGANGMU combines She Chuang Zi, Ku Shen and Bai Bu with cooling borneol and menthol in a moisturising base. It contains no steroids (none of eight corticosteroids detected by TÜV SÜD PSB), so it will not mask a fungal rash. Use it on itchy groin-crease skin for comfort alongside an antifungal cream, never on the genitals, and patch test first.
Frequently asked questions
What is the fastest way to get rid of jock itch?
Use an over-the-counter antifungal cream such as terbinafine or clotrimazole once or twice a day, keep the area dry, and continue for 1 to 2 weeks after the rash clears. Treat athlete's foot at the same time if you have it.
How long does jock itch last?
With an antifungal cream most cases improve within 2 weeks and clear in 2 to 4 weeks. Without treatment it can last for months and keep spreading.
How can I tell jock itch from eczema?
Jock itch usually has a raised, scaly edge that spreads outward and spares the scrotum. Eczema tends to be dry or weepy without a sharp border. If unsure, a doctor can confirm it with a simple skin scraping.
Can I use hydrocortisone on jock itch?
Not on its own. Steroid creams can hide the fungus and let it spread. Use an antifungal, and ask a doctor before using any steroid on a groin rash.
Can I use QICAOGANGMU for jock itch?
Yes, for cooling itch relief on the groin crease and inner thigh alongside an antifungal cream. It is steroid-free, so it will not mask the infection. Do not apply it to the genitals, and patch test first.
Related articles
References
- El-Gohary M, van Zuuren EJ, Fedorowicz Z, et al. Topical antifungal treatments for tinea cruris and tinea corporis. Cochrane Database Syst Rev. 2014;(8):CD009992. PMID 25090020
- Caplan AS, Gold JAW, Smith DJ, et al. Diagnosis and management of tinea infections. Am Fam Physician. 2025;112(4):382-392. PMID 41118183
- Kalra MG, Higgins KE, Kinney BS. Intertrigo and secondary skin infections. Am Fam Physician. 2014;89(7):569-573. PMID 24695603
- Yanyun C, Ying T, Wei K, Hua F. Preliminary study on antifungal mechanism of aqueous extract of Cnidium monnieri against Trichophyton rubrum. Front Microbiol. 2021;12:707174. PMC8417377
- Li LP, Wang XJ, Zhang JY, et al. Antifungal activity of osthol in vitro and enhancement in vivo through Eudragit S100 nanocarriers. Virulence. 2018;9(1):555-562. PMID 28795862
- Tian W, He D, Liu J, et al. Topical borneol relieves nonhistaminergic pruritus via targeting TRPA1 and TRPM8 channels in peripheral nerve terminals of mice. Eur J Pharmacol. 2023;953:175833. PMID 37290679
Product information. This article is educational and does not replace medical advice. QICAOGANGMU is a topical herbal skin-care cream and is not an antifungal medicine. Use a proven antifungal treatment for jock itch and see a doctor if the rash does not improve.
