Hi and welcome to HCM From your description it does seem like an allergic reaction. The causes maybe various- food items, dust, pollen , outdoor plants, any recent outdoor activity, new cosmetics or jewellery(earrings), also could be due to sun exposure which may have aggravated an allergy. Did you take any new medication? In any case keep a note of whether it is increasing and if there are any factors which cause it to increase. Does anyone around have similar complaints? Take a course of antihistamines like fexofenadine daily for a week. If the rash is severe apply a light layer of fluticasone cream at night for a week and stop. During the day you can use a soothing lotion with calamine/aloe vera for the face. Use a gentle cleanser. If it persisits inspite of treatment consult your dermatologist . Also you can do tests for allergy sensitivity if required. Do remember, if you are allergic to something, you must be careful to avoid it, as any re exposure will cause a reaction again. So keep a track of such events. Hope this helps.