What causes rashes in the armpits and groin areas that are extremely itchy?

Under normal circumstances, rashes in the armpits or groin area accompanied by intense itching may be related to mosquito bites, eczema, allergies, folliculitis, tinea corporis, and other factors. Patients are advised to follow medical guidance for symptomatic treatment. Specific analysis is as follows:

1. Mosquito bites

When a patient's skin is accidentally bitten by insects or mosquitoes, their toxins may enter the body and cause local symptoms such as itching, redness, and papules. It is recommended that patients apply floral water (e.g., insect-repellent lotion) topically to the affected area to relieve symptoms, while avoiding scratching to prevent further irritation.

2. Eczema

If rashes and itching in the armpits, groin, and elbow creases are caused by eczema, patients should avoid re-exposure to triggering factors in daily life. Topical corticosteroid medications, such as triamcinolone acetonide acetate urea cream or mometasone furoate cream, can be used according to medical advice to achieve anti-inflammatory and anti-allergic effects.

3. Allergy

This condition is primarily associated with a sensitive constitution. After exposure to an allergen, patients may develop rashes in the armpit and groin areas with severe itching. The allergen should be removed as soon as possible. Additionally, calamine lotion can be applied locally. If necessary, oral antihistamines such as loratadine tablets or cetirizine hydrochloride tablets may be taken under medical supervision.

4. Folliculitis

Folliculitis may be triggered by improper diet, low immunity, prolonged sitting, or long-term medication use, leading to the development of red papules or white pustules in localized areas, often accompanied by itching and pain. Patients may follow medical advice to use topical medications such as mupirocin ointment or fusidic acid sodium ointment for treatment.

5. Tinea corporis (ringworm)

Tinea corporis is a fungal infection caused by dermatophytes and may be associated with fungal invasion or prolonged exposure to warm, humid environments. Patients may experience the aforementioned symptoms along with varying degrees of itching and papule formation. It is recommended that patients use antifungal creams such as terbinafine hydrochloride cream or miconazole nitrate cream under a doctor’s guidance.

In addition to the above, similar symptoms may also be related to conditions such as urticaria or generalized rashes. Patients are advised to seek timely medical evaluation at a hospital to avoid delays in diagnosis and treatment.