# Photo*aging.*

> Photoaging explained: UVA vs. UVB, what happens in the skin, typical signs, understanding SPF correctly

- Source: https://www.vivaderm.de/lexicon-photoaging-en.html
- Language: en
- Publisher: VIVA DERM, Privatpraxis für ästhetische Medizin, Rosastraße 6a, 45130 Essen, Germany, +49 1520 8367711
- Responsible physician: Katayoun Mostaghimi (Fachärztin für Allgemeinmedizin)
- Updated: 2026-10-05

Premature skin ageing from UV radiation: pigment spots, elastosis, deep lines and coarse texture. The biggest single factor in visible ageing – and the most avoidable.

## A closer look.

UVB radiation causes sunburn and DNA damage in the epidermis; UVA penetrates deeper, generates free radicals and destroys collagen and elastin in the dermis – also through window glass and under cloud. Over years this adds up to photoaging: pigment spots, yellowish leathery skin, coarse pores, crinkle lines and dilated vessels.

Sun protection is therefore the most effective anti-ageing measure of all. SPF 30 blocks about 97 % of UVB, SPF 50 about 98 % – what matters is broad-spectrum protection (UVA seal), sufficient amount (two finger-lengths for the face) and daily use, not only on holiday. Antioxidants such as vitamin C complement the protection.

Existing sun damage can be partly softened: retinoids renew the epidermis, microneedling, PRP and polynucleotides stimulate the dermis, skin boosters improve hydration and elasticity. Pigment spots and vessels are a matter for dermatology with laser or light – we refer for that.

This lexicon entry is general information and does not replace the medical consultation required under German law (§ 630e BGB).

## At a glance.

- **UVA:** deep, collagen breakdown, also through glass
- **UVB:** sunburn, DNA damage
- **SPF 30 vs. 50:** 97 % vs. 98 % UVB
- **Amount for face:** two finger-lengths

## Frequently asked questions.

**Is SPF in a day cream enough?**

Usually not: the amount applied is too small and many day creams lack full UVA protection.

**Does sun protection still help at 50?**

Yes. The skin keeps repairing minor damage when new damage stops; studies show improvements after just one year.

## Related pages.

- [Skin ageing](https://www.vivaderm.de/lexicon-hautalterung-en.html) – Lexicon
- [Elastin](https://www.vivaderm.de/lexicon-elastin-en.html) – Lexicon
- [Microneedling](https://www.vivaderm.de/microneedling-en.html) – Treatment

## Sources

- [German Society of Dermatology (DDG)](https://derma.de/)
- [DermNet – dermatology reference](https://dermnetnz.org/)
- [American Academy of Dermatology](https://www.aad.org/)
- [PubMed – biomedical literature database](https://pubmed.ncbi.nlm.nih.gov/)
- [NHS: sunscreen and sun safety](https://www.nhs.uk/live-well/healthy-body/sunscreen-and-sun-safety/)
- [WHO: ultraviolet radiation fact sheet](https://www.who.int/news-room/fact-sheets/detail/ultraviolet-radiation)
- [Hautkrebs-Screening.de – German skin cancer screening portal](https://www.hautkrebs-screening.de/)

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This page is general information and does not replace medical consultation and informed consent (§ 630e BGB). No guarantee of results. Prices are guide prices per GOÄ. Quoting with attribution (VIVA DERM, Essen) is expressly permitted.