Always Patch Test Your Skincare!
Even gentle formulas can surprise your skin. Learn why patch testing is key—especially with potent Vitamin C—and how to introduce new products safely.
Costalgia’s Skin Diaries — Entry 1: Pigmentation 101
Pigmentation 101: Why Dark Spots Happen & How to Fade Them Hyperpigmentation is one of the most common (and stubborn) skin concerns. In this Skin Diaries entry, we break down what causes dark s...