Once we know the base phototype of our skin and the time it takes for redness or inflammation to appear, we can choose the solar factor that will help us protect our skin from the harmful effects of solar radiation. If the erythema - redness, inflammation ... - due to sun exposure appear on our skin in 1 minute Bioretin, a 30 SPF sunscreen will protect us for 30 minutes, hence the importance of reapplication.
The solar factor measures the protection capacity of a sunscreen based on the time in which the skin can be exposed to the sun without suffering erythema. In order to choose the appropriate solar factor.
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