Johns Hopkins Medicine 2:47 Sweating Can Lead to Heat Rash: Here’s What To Do About the ... Typically, heat rash (even in babies and toddlers) will clear up by itself. But if you notice any signs of infection or heat exhau... International Hyperhidrosis Society Show all Painful pea-sized lumps that persist for weeks. Recurring boils that may drain fluid or pus. Pitted skin or "double-headed" blackheads in the armpit area. Heat rash (tiny, stinging bumps) that appears after heavy sweating. Quick Tips for Relief at Home: Warm Compresses: Use a warm, damp cloth for 10 minutes a few times a day to encourage drainage and soothe pain. Let It Breathe: Wear loose-fitting, cotton clothing to reduce friction and allow sweat to evaporate. Gentle Exfoliation: Use a mild scrub or a soft brush in circular motions to help clear dead skin cells. Avoid the Urge to Pop: Squeezing these lumps can push the infection deeper, causing more pain and potential scarring. When to See a Pro: If the bumps are spreading, extremely painful, or causing a fever, it's time to visit a dermatologist. Treatments like