Red,bit itchy, sore & swollen left labia majora after shaving. happens repeatedly sometimes after periods. is it yeast infection? how to treat it at home & how to avoid it later? can i use antiseptic foaming solution (cytal) without dr prescription?

Exam!: It's not a good idea to self-treat this type of problem. You could have a bacterial infection or trichomoniasis. There are other possible causes of your problem such as a cyst, allergies & sex without enough lubrication. You must be properly evaluated at a medical clinic to be treated appropriately for your problem. So please get a medical exam as soon as possible. I wish you well!

Labia problems: Don't shave labia - that is a great way to get nicks and cuts which can then be a portal for infections. Yeast probably wouldn't cause unilatera swelling and is often accompanied by a non-odorous, clumpy white discharge. You might try soaking with epsom salts. If this is not resolving then medical evaluation would be prudent. DON'T shave labia.