Sweat Rash?

hi there, i recently returned from holiday in greece, after sum chafing on a night out i woke up in the morning with a sweat rash, over the next couple of days i developed a rash on my chest and arms and back. Now iv noticed dots on my penis. I didnt have any sxual activity on holiday and hadnt had any sort of dots before the holiday....cud i have got something off the sheets or something as i slept nude?
Thanks

[Dr_Aparna]

Hi,
This could be an allergic response to the sun or sand or both. A sun rash is seen as small, reddish blisters or small or large spots in areas that have been exposed to sunlight. Some areas, for example, the face, can be spared. This rash usually appears after minutes' or hours' exposure to the sun and can be extremely itchy.

The only remedy is to use a sunscreen with a high sun protection factor (SPF). The SPF indicates how effectively the cream protects you from harmful light.
Photoallergic dermatitis can be caused by the action of sunlight on skin exposed to certain chemicals. Some substances such as perfume or soap can make the skin extra sensitive to the sun.

Photoallergic dermatitis can be prevented by avoiding contact with the substances that cause it.
Treatment will be with anti-histamines like Cetrizine, Loratidine etc. These drugs will block the action of histamine, which is the mediator of these reactions.

You can apply Calamine lotion on the rash. If there is no improvement in 3-5 days, you can apply a mild Corticosteroid ointment.
ref:http://www.netdoctor.co.uk/diseases/facts/sunrash.htm