A swollen lip and an itchy rash on the legs may certainly be related to an "allergy". I accept that the rash and the swollen lip reponded quickly to treatment. You may be suffering from angioedema/hives. Cause are infections, medication, foodstuffs, injections, underlying systemic illness etc. Sometimes no cause can be found. Make up and soap is not the cause of this condition. The best treatment is antihistamines. Cosmetics may cause eczema. I am not 100% sure whether you are suffering from eczema or hives/angioedema.
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