What's the best way for me to prevent pityriasis alba to take control of my face like it did last summer?

Pityriasis alba: Pityriasis alba is a type of eczema that presents as lighter-than-skin-color patches on face & arms. It is more apparent in the summer because it doesn't tan when normal skin does. In the short term, the best thing to do is to apply a good broad-spectrum sunscreen so that your normal skin doesn't tan either. Also there are topical nonsteroid treatments. Steroids can lighten p. Alba even more.