Vitamin A and retinol in the summer.

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Retinoids are to be used with caution, only when necessary, having consulted their use with a physician. Summer time is not a contraindication, if the patient suffers from advanced acne, which requires such treatment. It’s best to use them at night. Such habit allows you to avoid resulting from the interaction of the sun with the chemical compounds in the products. You need to remember though that night use does not protect you from side effects – drying out and irritation – which combined with the sun may exacerbate the skin problem. That is why avoiding sun and strong filters (SPF 50) are a necessity, regardless whether you’re on vacation or in the city.
Read the full article here: Can you use retinoids in the summer?