This looks most consistent with an annular, scaly rash, which can be caused by a superficial fungal infection such as ringworm (tinea corporis) or, if it is in the groin/inner thigh, jock itch (tinea cruris). The ring-like border and scale support that possibility, but a photo cannot confirm it. Eczema, irritation/contact dermatitis, and other rashes can look similar.

Avoid using a steroid-only cream, since steroids can worsen or disguise fungal rashes. Keep the area dry, avoid sharing towels, and arrange an in-person assessment if it is spreading, very painful, draining pus, associated with fever, or not improving after 1-2 weeks of appropriate antifungal treatment. The CDC description of groin ringworm notes it often causes itchy, scaly red patches in skin folds.

If you tell me where it is, how long it has been there, and whether it itches/burns, I can help narrow down the possibilities.

Since it has persisted for 2 months, please arrange an in-person visit with a clinician or dermatologist. It may still be a fungal rash such as tinea/ringworm, but the duration means it should be checked, ideally with a simple skin scraping test, because eczema, psoriasis, and contact irritation can resemble it.

If you have not already tried treatment, a pharmacist or clinician may suggest a topical antifungal such as terbinafine or clotrimazole. Do not use a steroid-only or steroid-combination cream unless a clinician has diagnosed the rash, because steroids can make a fungal infection spread or look less typical. Keep the area dry and avoid tight clothing.

Get sooner care if it is rapidly spreading, painful, hot/swollen, oozing, you have fever, or you have diabetes or a weakened immune system. The CDC advises medical review for suspected ringworm and notes that topical antifungals are commonly used for 2-4 weeks.

Do you mean, “Is it only tinea cruris?”

It could be tinea cruris (jock itch), but I cannot confirm that from the photo alone. The scaly, ring-like area in a skin-fold/groin-type region is compatible with it. But a rash lasting 2 months can also be eczema, irritation, erythrasma, or inverse psoriasis.

A clinician can confirm with a quick skin-scraping/KOH test. If it is tinea cruris, treatment is usually a topical antifungal such as terbinafine or clotrimazole, while keeping the area dry. Check for athlete's foot too, because fungus from the feet can re-infect the groin. Avoid steroid-only or mixed steroid-antifungal creams unless prescribed.

For uncomplicated tinea cruris (jock itch), a good first choice is:

Wash, dry very well, then apply. Continue for the full course even if it improves early. Keep the groin dry, wear loose cotton underwear, change underwear daily, and treat any athlete’s foot at the same time if present.

Do not use steroid-only creams or combination creams containing steroids (for example betamethasone, clobetasol, mometasone) unless specifically prescribed. They can make fungal infection worse.

Because yours has lasted about 2 months, see a clinician if it has not clearly improved after 2 weeks of correct treatment, is spreading, or keeps returning. You may need confirmation of the diagnosis or prescription oral treatment. The CDC treatment guidance supports topical antifungals for jock itch.

For tinea cruris (jock itch), the best first-choice cream is usually:

Terbinafine 1% cream
Apply a thin layer to the rash and 1-2 cm beyond its edge, once daily for 2 weeks.

If terbinafine is not available, use:

Clotrimazole 1% cream
Apply twice daily for 2-4 weeks.

Because your rash has already been present for 2 months, see a dermatologist or clinician if it does not clearly improve within 2 weeks of using terbinafine correctly. Do not use creams containing steroid medicines such as betamethasone, clobetasol, or mometasone unless prescribed.

For tinea cruris (jock itch), the best first option is usually:

Terbinafine 1% cream
Apply a thin layer to the rash and 1-2 cm around it once daily for 1-2 weeks.

If terbinafine is not available, use:

Clotrimazole 1% cream
Apply twice daily for 2-4 weeks.

Keep the area dry and wear loose cotton underwear. Avoid any cream containing a steroid such as betamethasone, clobetasol, or mometasone unless a doctor specifically prescribes it.

Since yours has been present for 2 months, see a clinician if it does not clearly improve after 2 weeks of proper treatment.