Photosensitivity Isn’t Just Sunburn—It’s an Immune Reaction In this post, Jody Taylor breaks down the difference between phototoxic and photoallergic responses, and why certain skincare ingredients, medications, and conditions can make your skin react to sunlight in ways that go far beyond a typical burn. If you’ve ever felt confused about sudden rashes, redness, or sensitivity after sun exposure, this is the clarity you’ve been looking for.