Red spots spreading quickly near the armpit are signs of what disease?

Question
Hello doctor,
I have large light red spots like ringworm near my armpits and it spreads very quickly. So the doctor told me that a red spot that spreads quickly near the armpit is a sign of disease? I thank you doctor.
Tran Minh Tri (1999)
Answer
Answered by Specialist Doctor I Le Thi Thu Hang - Department of Medical Examination & Internal Medicine, Vinmec Hai Phong International General Hospital.
Hello,
With the question “What is the sign of a red spot that spreads quickly near the armpit? ", the doctor would like to answer as follows:
You have red spots in the armpits that spread quickly, maybe you have tinea versicolor. Tinea versicolor is a disease caused by yeast, the disease is usually caused by G6 that is aggravated in humid or sweaty summer weather.
In case of small lesions, you can use topical antifungal drugs containing Terbinafine, Clotrimazole, G6, .. applied for 2-3 weeks. In case the disease does not decrease, you should see a dermatologist for diagnostic tests and treatment.
If you still have questions about red spots spreading quickly near the armpits, you can go to the hospital of Vinmec Health System for further examination and advice. Thank you for trusting and sending questions to Vinmec. Wishing you lots of health.
Best regards!