yeah exposure to the sun is a big one..sunblock and makeup or moisturizer with an spf of 15 or higher works well but sometimes you might forget and idk about other people but if i'm out in the sun too long without any sunblock..i tend to burn lol
for me it would also be sun exposure. i tend to burn on my face during the summer usually. sometimes, even with sunscreen! and i have naturally curly hair which does sometimes frizz in summer, when i leave it curly and when its straightened! i hate when that happens, lol.
