September 2025   in “International Journal of Cosmetic Science”    Heat and UV exposure damage hair structure by altering keratins.  
     
           27 citations
,
  January 2002   in “Exogenous Dermatology”    Chronic exposure to sunlight may worsen male pattern baldness and protecting the scalp from the sun could slow it down.  
               31 citations
,
  February 1999   in “Dermatologic surgery”    Sun exposure after laser hair removal can cause skin darkening, which is hard to treat and requires avoiding UV light.  
     
           11 citations
,
  April 2013   in “SpringerPlus”    Human skin's melanocytes respond to light by changing shape, producing pigments and hormones, which may affect sleep patterns.  
     
           32 citations
,
  September 1989   in “Medical Clinics of North America”    Skin problems are common in lupus, important for diagnosis, and can be triggered by sunlight.