A prolonged pressure due to walking and Vitamin B12 / Thiamine deficiency due to increased alcohol is the likely cause for the blister. Following measures should be able to heal it;
1) Application of neosporin ointment.
2) Wearing Sandals as this will avoid sweating due to shoes and help in healing and drying it out.
3) Avoiding standing and walking much so healing can be facilitated.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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