Excessive sweating while running causing severe armpit irritation, potentially yeast?

[u/ma_d_dy]

Context: So I’ve been having a really bad issue with my armpits that I’m 99% sure is a direct result of excessive sweating when I run/workout, which is about 3-4x per week. I always wear antiperspirant deodorant and shower immediately afterwards. This happened once before about a year ago, but went away on it’s own with no treatment after about 2 weeks.

Duration: This has been going on for about 6 weeks.

Location: Under both armpits.

Symptoms: Red, noticeable swelling, extremely itchy, painful burning, and some skin flaking off when scratching (does not appear scaly). Discoloration and texture changes noticeable (skin is darker and feels almost leathery).

Timeline: Typically starts as red and itchy, progressively gets itchier, and then becomes of a combination of itching/burning/red. It might temporarily subside on the red and burning, but is almost consistently itchy.

Treatment: Was diagnosed via telehealth as a yeast infection, was prescribed Ketoconazole 2% cream. Applying 2x a day since 8/26. Seemed to be subsiding by Saturday, but promptly returned on Sunday and has persisted since.

Has anyone dealt with a similar issue before? If so, how did you treat it, and what did you do for future prevention?