Spironolactone - Immunity and scars

Hi! Spiro changed my life 2 years ago and I was 100% clear. However, recently my pharmacy changed manufacturers and I broke out. My doctor increased my dosage. Can you become immune to spiro? (I hope not because it changed my life!) Also - I have red marks from where the my two break outs occurred - how long does the pigmentation take till it fades? I've been on the higher dosage for 2 months. Thanks!

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