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[|Human|] Hi, I received my BCG vaccination yesterday and I already have a large ulcer which is weeping. Most of the literature I have read has indicated that a red mark should appear within 1-2 weeks of the vaccination followed by the ulcer. Is my reaction abnormal? Also, am I able to use and antiseptic/disinfectant on the ulcer? If not, why not?
[|AI|]  Thanks for posting your question on Chat Doctor! I can understand your problem, nothing to worry about it. You are right. Actually ulcer develops after 3-4 weeks of vaccination. The reaction in your case might have started within hours after vaccination and a large weeping ulcer is formed within few hours later. This is an exaggerated and accelerated reaction suggestive of previous infection with Mycobacterium tuberculosis. Size of the erythema, induration, nodule, pustule, ulcer and scar all are bigger than those in the uninfected. Ulcer will heal into the scar earlier. Application of antiseptic agents can lead to local irritation & hence to be avoided. However, if you develop infection or abscess you will have to take oral antibiotics. Kindly consult your doctor for the interpretation of the results with clinical correlation. I hope your doubts have been clarified. Take care of your health.