Your body's changing hormone levels can trigger pigment cells to produce more color than necessary. This creates persistent patches that standard treatments rarely solve completely. 

Both UV rays and regular visible light activate pigment through different pathways. Basic sun protection often falls short. Your skin needs comprehensive, strategic defense. 

Daily activities like cooking, hot showers, and exercise can trigger flares without any sun exposure. Your routine itself can intensify pigment problems despite careful sun avoidance. 

When your skin's protective shield weakens, all other triggers have greater impact. This creates cycles of improvement and relapse that frustrate conventional treatment plans.