I don't "catch" the sun & I never have
It's not a case of going red/pink/brown or anything - I just stay white (or beige as DD likes to say) my dad has always described my skin colour as uncooked biscuit dough 
In 76 I had a pale smattering of freckles accross my shoulders after a 2 weeks beach holiday (aged 8) with no sun cream!!
When I had DD I decided that I should use sun cream as it would be the only way to make her....you know monkey see monkey do (I did the same with cycle helmets)
I have sensative skin so have always used a "good" brand - but at Christmas was persuaded to buy a new make used it and got slightly red shoulders (it's a factor 30 & I assumed Egypt sun was much stronger)
Today I used in on my arms, neck & chest while at a car boot sale (not my legs - tho' I was wearing shorts)
Everywhere I put it I have burnt and my legs/lower arms and face are fine - at first I thought this was 'cos they got more sun - but my hands are burnt too
Could the suncream have caused me to get burnt somehow?
It is a silly idea in't it....sorry