Why is folliculitis more severe in winter?

Reasons why folliculitis worsens in winter include: 1. Dry climate: Winter weather is typically dry, which can lead to skin dehydration, reduced sebum production, and easy blockage of hair follicles, thereby triggering folliculitis or exacerbating its symptoms. 2. Vitamin D deficiency: Reduced sunlight exposure in winter may lead to vitamin D deficiency, making hair follicles more susceptible to bacterial infections. 3. Poor blood circulation: Cold weather can impair blood circulation, reducing oxygen and nutrient supply to the tissues surrounding hair follicles, lowering their resistance, and increasing the likelihood of infection. 4. Weakened immunity: People tend to engage in less outdoor activity during winter, leading to a decline in immunity and a reduced ability to effectively resist pathogen invasion, resulting in recurrent folliculitis.