• When I looked this up on, it basically said that the redness is increased blood flow to the skin and cell damage- a response to UV-B rays from the sun, especially if you do not have a built up tan and are caucasian. "The underlying cause of this vascular reaction is direct and indirect damage to specific cellular targets from photochemical reactions and the generation of reactive oxygen species [32]. Damage to DNA, and the activation of several inflammatory pathways, particularly involving prostaglandins [27, 33-38], are thought to trigger this reaction, ultimately leading to vasodilation and edema. Biologic response modifiers released by both keratinocytes and lymphocytes also play a role..."

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