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The impact of the sun on skin depends on each person’s genetic background. We all essentially have different skin types, more or less capable of reacting to or defending itself from ultraviolet rays. For example, darker skins are less sensitive to the sun than white skins.
Furthermore, the appearance of spots caused by the sun will vary according to the exposure to sun accumulated over a lifetime.
The 4 stages of Glogau
There is a classification, called the Glogau classification, which describes the evolution of spots caused by the sun. It takes into account the epidermic, dermic and hypodermic changes.
- At stage 1, from 28 to 35 years old, photo-ageing is light. The texture of the skin is slightly uneven and the skin can lack radiance. There is no skin sagging and only a few wrinkles appear.
- At stage 2, between 35 and 50 years old, photo-ageing is moderate. Lentigos appear. Keratosis cannot be seen but is perceptible to the touch. There is still no, or only little skin sagging. Superficial wrinkles appear. Any anomalies of blood circulation and pigmentation are mild.
- At stage 3, between 50 and 65 years old, photo-ageing is advanced. Keratosis is visible: known as hyperchromia. Skin sagging is moderate and some wrinkles are visible. Anomalies of blood circulation and pigmentation are marked.
- At stage 4, between 65 and 75 years old, photo-ageing is severe. Wrinkles are marked and actinic keratosis (or solar keratosis, the thickening of the skin due to the sun) appears. Cancerous lesions are possible. Skin sagging is significant and wrinkles are deep and widespread. Anomalies of blood circulation and pigmentation are significant.