Many people find that their roots become flatter, shinier or visibly oily much sooner in summer. It is tempting to conclude that heat simply makes the scalp produce more oil. The biology is more nuanced....

We routinely change how we care for our skin during summer. We use sun protection, choose lighter products and adapt our routines to heat and humidity. Yet the scalp, which is also skin, is often...

The scalp is often missed during sun protection. Dense hair provides some shade, but it is not a reliable substitute for a hat, shade or sunscreen. The parting, hairline, ears and areas of thinning or...