Thank you for your question. If after taking the antibiotic amoxicillin you developed this rash, it is possible that you could be experiencing an allergic reaction to this medication. Amoxicillin is a penicillin class of antibiotics and there are many individuals have allergies to this medication. Another possible cause for your itching and bumps within your vulva could be due to the fact that you have developed a opportunistic infection after completing your antibiotic course. A side effect of antibiotics is that it disrupts the natural bacterial colonies and pH of the vaginal canal, and makes it susceptible to infections with opportunistic organisms such as candidia albicans (the causative agent of yeast infections). We recommend that you visit your doctor to be evaluated for either of these possibilities. If you are having an allergic reaction, you may be prescribed medication to reduce your symptoms, and if it is indeed an infection you will prescribed medications to treat it accordingly.
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