We are returning to mainland Greece in mid-May and I would like to prevent a recurrence of the problem I experienced last year of prickly heat/allergic reaction to sun cream. I am always very careful about spending time in the sun. I have typical English colouring, fair skin and mousey hair plus a tendency to eczema. Last year, as usual, I used a sun cream for sensitive skins, limited my exposure to the sun but ended up with the most appalling itchy rash all over. It was difficult to tell if it was the sun or the cream. All I know was that I had to spend the whole holiday covered up, plastered in calamine lotion; not a pretty sight. I tried to purchase a different sun cream at a local chemist but I think the damage was already done. Any suggestions?

Dr Jules Eden replies: This is a common problem. We all read about and wisely act on the dangers of the sun's UVA and UVB radiation, but for many the creams can cause a problem, so try a few different ones until you have found what works for you. Prickly heat occurs when the sweat ducts of the skin get blocked, the sweat causes a bubble that itches and the rest of the holiday can be spent in purgatory. The key here is for you to wear loose cotton clothing that covers most of your limbs, and avoid midday sun. It is clear you are not after a tropical tan, so the clothes shouldn't be an embarrassment. Remember, though, that UV rays can penetrate clothing, so you may still need a cream. Finally, any activity that makes you sweat more will increase your chances of blocked sweat ducts. Apply common sense: a desert camel ride versus lying by a shady hotel pool... you can see where I am coming from.

If you have any questions you want to ask Dr Jules Eden, email travel.doctor@theguardian.com, or write to The Flying Doctor, The Guardian, 119 Farringdon Road, London EC1R 3ER.