Other causes of an armpit rash include a yeast infection, psoriasis, or seborrheic dermatitis. Rashes are pesky patches of irritated skin that can affect any part of your body, including your armpits.

“Underarm dermatitis differs from other ... “Warmth, moisture and friction can promote irritation and sometimes fungal or ...

Fungal Infections: The moisture and heat in the armpits create an ideal environment for fungi to grow, leading to infections ...