rash from tanning

I have been tanning now for about a month and am starting to get a itchy rash only on my chest. they look like pimples everywhere. The more I itch the worse it gets, and it seems to be spreading. Is there anything I can use on it to clear it up?

[Dr_Aparna]

Hi,
Physical allergies are allergic reactions to cold, sunlight, heat, or minor injury.
The immune system usually responds only to certain kinds of chemicals, namely proteins. However, non-proteins can trigger the same sort of response, probably by altering a protein to make it look like a target. Physical allergy refers to reactions in which a protein is not the initial inciting agent.
Sometimes it takes a combination of elements to produce an allergic reaction. A classic example is drugs that are capable of sensitizing the skin to sunlight. The result is phototoxicity, which appears as an increased sensitivity to sunlight or as localized skin rashes on sun-exposed areas.
If sun is involved, shade and sunscreens are necessary. The reaction can usually be controlled with epinephrine, antihistamines, or cortisone-like drugs. Itching can be controlled with cold packs or commercial topical agents that contain menthol, camphor, eucalyptus oil, aloe, antihistamines, or cortisone preparations.
ref:http://www.myonlinewellness.com/topic/physicallergy
You could start by taking Benadryl and OTC anti-histamines.Apply calamine lotion to soothe the skin.