You have not described the location , type, size, presence of any other associated symptoms and signs like pain, redness or tenderness in the swelling, fever, whether any urinary symptoms are present or not. Without knowing all these, it would be difficult to comment on the cause of the swelling.
There could be several causes for rashes and itch such as hives, insect bites, dermatitis, psoriasis or any allergic reaction. You should also let us know since how long this rash is present. Does your friend have any history of allergy?
Hives or urticaria is an allergic condition which causes red and sometimes itchy bumps on your skin. Hives can occur anywhere on the body such as the trunk, arms, and legs.
They are usually allergic (food, medication and insect stings) but may also be due to infections and stress. Many a times no specific cause for them is ever found.
You may try some OTC antihistaminics (such as cetirizine, loratidine, benadryl). You may try calamine lotion locally which has a soothing effect. You need to maintain a good personal hygiene and thoroughly wash several times daily. If the rash or swelling persists, I would advise you to undergo a consultation with your GP.
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