Red circular patch suddenly appeared in the armpit

The armpit generally refers to the axilla. The sudden appearance of red circular patches in the armpit may be caused by conditions such as furuncles (boils), eczema, or folliculitis. Appropriate treatment should be selected based on the specific underlying cause. Detailed analysis is as follows:

1. Furuncle (Boil)

When hygiene in the armpit area is neglected, furuncles may develop, leading to the sudden appearance of red bumps under the arm. Patients can use medications such as ichthammol ointment, mupirocin ointment, or clindamycin hydrochloride gel under a doctor's guidance.

2. Eczema

The armpit area tends to remain moist, which may trigger eczema. This condition typically presents as multiple red lesions accompanied by symptoms such as itching, blisters, and weeping. Patients may use medications like desonide cream, tacrolimus ointment, or pimecrolimus cream as directed by a physician.

3. Folliculitis

Folliculitis is usually caused by bacterial infection due to poor local hygiene. It may result in localized redness, swelling, and pain, primarily manifesting as redness around hair follicles in the armpit. Treatment options include topical agents such as ofloxacin gel, fusidic acid cream, or mupirocin ointment, used according to medical advice.

In addition to the above, similar symptoms may also be caused by conditions such as trichomycosis axillaris, sebaceous cysts, or soft fibromas. It is recommended to seek timely medical evaluation at a hospital for accurate diagnosis and effective treatment.