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Could you attach a picture that is a close-up of the affected skin?
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The most common type of reaction to freon is an irritant contact dermatitis. It is possible that it also could be a more typical type of allergy, but a contact dermatitis is more common.
If it is a more typical allergy, then trying an oral antihistamine may be helpful, and any of the over the counter antihistamines would be fine. It also may help to use an H2 blocker, such as ranitidine. Actually, an H2 blocker is another type of antihistamine. The traditional antihistamine blocks the H1 receptor and were on the market for many years before the first H2 blocker was discovered, so it was thought that it would be confusing if the new drug class were also called antihistamines.
If it is a contact dermatitis that has not responded to a topical steroid, such as betamethasone valerate, the usual next step would be the use of systemic steroids, most often as oral prednisone, but a more severe case may be treated with an IM injection. However, either of these options would require seeing your doctor, since neither are available over the counter.
If I can provide any clarification, please let me know.
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