What causes red bumps on the buttocks from prolonged sitting in summer, and what should be done about it?

Red bumps on the buttocks after prolonged sitting in summer may be caused by localized heat and poor ventilation, friction, prickly heat, folliculitis, or eczema. These issues can be improved by adjusting sitting posture, keeping the area dry, and using medication. If the bumps become dense, itchy, pus-filled, or increasingly painful, prompt medical attention is necessary.

1. Localized Heat and Poor Ventilation: High temperatures in summer combined with prolonged sitting prevent sweat from evaporating promptly, leaving the skin in a persistently moist environment that leads to red bumps and a mild sensation of stuffiness. It is recommended to avoid sitting for long periods—stand up and move every 30 minutes—and wear loose, breathable cotton clothing to keep the buttocks dry.

2. Friction Irritation: Continuous rubbing of the buttock skin against clothing or seating during prolonged sitting can damage the skin barrier and trigger red papules, potentially worsening discomfort during movement. Use soft, breathable seat cushions to reduce friction, and avoid wearing tight, non-breathable pants.

3. Prickly Heat (Miliaria): Hot and humid conditions in summer can cause excessive sweating, leading to blocked sweat ducts. This results in clusters of tiny, needle-sized red bumps on the buttocks, accompanied by noticeable itching. Patients may use calamine lotion, talcum powder, or menthol ointment under a doctor’s guidance to relieve symptoms.

4. Folliculitis: Prolonged sitting may lead to inadequate local hygiene, allowing bacterial infection of hair follicles and forming red papules, some with pus at the top, which may be tender when pressed. Under medical supervision, topical or oral antibiotics such as mupirocin ointment, erythromycin ointment, or cephalexin capsules can help alleviate symptoms.

5. Eczema: Moisture and friction may trigger eczema, causing red patches and papular bumps on the buttocks, along with intense itching, dryness, and flaking. As directed by a physician, treatments may include mometasone furoate cream, zinc oxide ointment, or loratadine tablets to manage symptoms.

Maintain cleanliness and dryness of the buttocks—wash daily with lukewarm water and thoroughly dry afterward. Wear loose, breathable cotton clothing, avoid scratching the bumps, eat a light diet avoiding spicy and irritating foods, maintain regular sleep patterns, and minimize skin exposure to hot, humid environments.