A sun allergy is not the best thing under the Sun (ha, ha, ha) but there are ways of dealing with it - dodging it, hiding from it and even bravely facing it - but only armed with a suitable protection.
Come spring time, I apply L'Oreal Solar Expertise anti-rides and anti-taches solaire creme (always sounds posher in French!, anti-wrinkle and brown spot cream for us, non-posh lot) as a base under my foundation. The sky used to be the limit for SPF, until someone realized it was ridiculous and nowadays you can only go up to 50+ . I am not going to lie, it is going to make your skin shiny and that might not be your cup of tea. However, it is a reliable protection and you can use it equally for your hands and chest (you should appreciate it when YOU are 50). It cost 15 EUR at Di.
The description by
L'Oreal:
UVA PROTECTION :
Advance protection conforms to the new European recommendations to prevent premature skin ageing caused by sun exposure: lines, brown spots, drying…
UVB PROTECTION :
Very High.
ANTI-AGEING SUN CARE:
Active Anti-Wrinkle and Age Spot Sun Cream enriched with Hyaluronic Acid and + Melanin-Control helps make lines appear reduced and prevents an increase in the appearance of age spots.
(http://www.loreal-paris.co.uk, 2. 5. 2011)