instruction: hi doctor two years back during my holidays I developed a large rash over the whole of my legs it was described as petechiae when I got back to my native the infection had got into my blood stream and my white blood cell count was extremely high it took some time for it to return to normal I always have problems with reactions to the sun I used to develop rashes swellings severe burns even if only going out for five minutes also fully covered dizziness and tiredness however I am again going on holiday later this month I would like to know how I can protect myself so this does not happen again I have been taking antihistamines for two months now I noted that sunscreen did not help to prevent this last time please give some advice regarding this thank you
output: hi confine your summer excursions to early in the morning and late in the evening wear clothes that cover exposed areas uniformly use sunscreen with spy 50 particularly that which has zinc in it I also suggest vitamin supplement and antioxidants like carotenoids and polyphenols consult your doctor discuss with him or her and take the medicine with consent avoid your tour to high altitudes and snowy areas as snow reflects sun and may cause worse sun burn for further information consult an internal medicine physician online